%0 Journal Article %J https://arxiv.org/abs/2310.16155 %D Submitted %T Coherent control of a superconducting qubit using light %A Hana K Warner %A Holzgrafe, Jeffrey %A Beatriz Yankelevich %A David Barton %A Stefano Poletto %A CJ Xin %A Neil Sinclair %A Di Zhu %A Eyob Sete %A Brandon Langley %A Emma Batson %A Marco Colangelo %A Amirhassan Shams-Ansari %A Graham Joe %A Karl K Berggren %A Jiang, Liang %A Matthew Reagor %A Loncar, Marko %X Quantum science and technology promise the realization of a powerful computational resource that relies on a network of quantum processors connected with low loss and low noise communication channels capable of distributing entangled states [1,2]. While superconducting microwave qubits (3-8 GHz) operating in cryogenic environments have emerged as promising candidates for quantum processor nodes due to their strong Josephson nonlinearity and low loss [3], the information between spatially separated processor nodes will likely be carried at room temperature via telecommunication photons (200 THz) propagating in low loss optical fibers. Transduction of quantum information [4-10] between these disparate frequencies is therefore critical to leverage the advantages of each platform by interfacing quantum resources. Here, we demonstrate coherent optical control of a superconducting qubit. We achieve this by developing a microwave-optical quantum transducer that operates with up to 1.18% conversion efficiency (1.16% cooperativity) and demonstrate optically-driven Rabi oscillations (2.27 MHz) in a superconducting qubit without impacting qubit coherence times (800 ns). Finally, we discuss outlooks towards using the transducer to network quantum processor nodes. %B https://arxiv.org/abs/2310.16155 %G eng %U https://arxiv.org/abs/2310.16155 %0 Journal Article %J https://arxiv.org/abs/2310.06236v1 %D Submitted %T Engineering Phonon-Qubit Interactions using Phononic Crystals %A Kazuhiro Kuruma %A Benjamin Pingault %A Cleaven Chia %A Haas, Michael %A Graham D Joe %A Daniel Rimoli Assumpcao %A Sophie Weiyi Ding %A Chang Jin %A CJ Xin %A Matthew Yeh %A Neil Sinclair %A Lončar, Marko %X The ability to control phonons in solids is key for diverse quantum applications, ranging from quantum information processing to sensing. Often, phonons are sources of noise and decoherence, since they can interact with a variety of solid-state quantum systems. To mitigate this, quantum systems typically operate at milli-Kelvin temperatures to reduce the number of thermal phonons. Here we demonstrate an alternative approach that relies on engineering phononic density of states, drawing inspiration from photonic bandgap structures that have been used to control the spontaneous emission of quantum emitters. We design and fabricate diamond phononic crystals with a complete phononic bandgap spanning 50 - 70 gigahertz, tailored to suppress interactions of a single silicon-vacancy color center with resonant phonons of the thermal bath. At 4 Kelvin, we demonstrate a reduction of the phonon-induced orbital relaxation rate of the color center by a factor of 18 compared to bulk. Furthermore, we show that the phononic bandgap can efficiently suppress phonon-color center interactions up to 20 Kelvin. In addition to enabling operation of quantum memories at higher temperatures, the ability to engineer qubit-phonon interactions may enable new functionalities for quantum science and technology, where phonons are used as carriers of quantum information. %B https://arxiv.org/abs/2310.06236v1 %G eng %U https://arxiv.org/abs/2310.06236v1 %0 Journal Article %J https://arxiv.org/abs/2310.01316 %D Submitted %T Entanglement of Nanophotonic Quantum Memory Nodes in a Telecommunication Network %A Can M Knaut %A Aziza Suleymanzade %A Yan-Cheng Wei %A Daniel R Assumpcao %A Pieter-Jan Stas %A Yan Qi Huan %A Bartholomeus Machielse %A Erik N Knall %A Madison Sutula %A Gefen Baranes %A Neil Sinclair %A Chawina De-Eknamkul %A David S Levonian %A Mihir K Bhaskar %A Park, Hongkun %A Lončar, Marko %A Mikhail D. Lukin %X A key challenge in realizing practical quantum networks for long-distance quantum communication involves robust entanglement between quantum memory nodes connected via fiber optical infrastructure. Here, we demonstrate a two-node quantum network composed of multi-qubit registers based on silicon-vacancy (SiV) centers in nanophotonic diamond cavities integrated with a telecommunication fiber network. Remote entanglement is generated via the cavity-enhanced interactions between the SiV's electron spin qubits and optical photons. Serial, heralded spin-photon entangling gate operations with time-bin qubits are used for robust entanglement of separated nodes. Long-lived nuclear spin qubits are used to provide second-long entanglement storage and integrated error detection. By integrating efficient bi-directional quantum frequency conversion of photonic communication qubits to telecommunication frequencies (1350 nm), we demonstrate entanglement of two nuclear spin memories through 40 km spools of low-loss fiber and a 35 km long fiber loop deployed in the Boston area urban environment, representing an enabling step towards practical quantum repeaters and large-scale quantum networks. %B https://arxiv.org/abs/2310.01316 %G eng %U https://arxiv.org/abs/2310.01316 %0 Journal Article %J https://arxiv.org/abs/2310.18838 %D Submitted %T High Q-factor diamond optomechanical resonators with silicon vacancy centers at millikelvin temperatures %A Graham D Joe %A Cleaven Chia %A Benjamin Pingault %A Haas, Michael %A Michelle Chalupnik %A Eliza Cornell %A Kazuhiro Kuruma %A Bartholomeus Machielse %A Neil Sinclair %A Meesala, Srujan %A Lončar, Marko %X Phonons are envisioned as coherent intermediaries between different types of quantum systems. Engineered nanoscale devices such as optomechanical crystals (OMCs) provide a platform to utilize phonons as quantum information carriers. Here we demonstrate OMCs in diamond designed for strong interactions between phonons and a silicon vacancy (SiV) spin. Using optical measurements at millikelvin temperatures, we measure a linewidth of 13 kHz (Q-factor of ~440,000) for 6 GHz acoustic modes, a record for diamond in the GHz frequency range and within an order of magnitude of state-of-the-art linewidths for OMCs in silicon. We investigate SiV optical and spin properties in these devices and outline a path towards a coherent spin-phonon interface. %B https://arxiv.org/abs/2310.18838 %G eng %U https://arxiv.org/abs/2310.18838 %0 Journal Article %J arXiv:2402.05811 %D Submitted %T High-Q Cavity Interface for Color Centers in Thin Film Diamond %A Ding, Sophie W. %A Haas, Michael %A Xinghan Guo %A Kazuhiro Kuruma %A Chang Jin %A Zixi Li %A David D. Awschalom %A Nazar Delegan %A F. Joseph Heremans %A High, Alex %A Loncar, Marko %X Quantum information technology offers the potential to realize unprecedented computational resources via secure channels capable of distributing entanglement between quantum computers. Diamond, as a host to atom-like defects with optically-accessible spin qubits, is a leading platform to realize quantum memory nodes needed to extend the reach of quantum links. Photonic crystal (PhC) cavities enhance light-matter interaction and are essential ingredients of an efficient interface between spins and photons that are used to store and communicate quantum information respectively. Despite great effort, however, the realization of visible PhC cavities with high quality factor (Q) and design flexibility is challenging in diamond. Here, we demonstrate one- and two-dimensional PhC cavities fabricated in recently developed thin-film diamonds, featuring Q-factors of 1.8x10^5 and 1.6x10^5, respectively, the highest Qs for visible PhC cavities realized in any material. Importantly, our fabrication process is simple and high-yield, based on conventional planar fabrication techniques, in contrast to previous approaches that rely on complex undercut methods. We also demonstrate fiber-coupled 1D PhC cavities with high photon extraction efficiency, and optical coupling between a single SiV center and such a cavity at 4K achieving a Purcell factor of 13. The demonstrated diamond thin-film photonic platform will improve the performance and scalability of quantum nodes and expand the range of quantum technologies. %B arXiv:2402.05811 %G eng %U https://arxiv.org/abs/2402.05811 %0 Journal Article %J arXiv:2402.11669 %D Submitted %T Hybrid Kerr-electro-optic frequency combs on thin-film lithium niobate %A Yunxiang Song %A Yaowen Hu %A Loncar, Marko %A Yang, Ki Youl %X Optical frequency combs are indispensable links between the optical and microwave domains, enabling a wide range of applications including precision spectroscopy, ultrastable frequency generation, and timekeeping. Chip-scale integration miniaturizes bulk implementations onto photonic chips, offering highly compact, stable, and power-efficient frequency comb sources. State of the art integrated frequency comb sources are based on resonantly-enhanced Kerr effect and, more recently, on electro-optic effect. While the former can routinely reach octave-spanning bandwidths and the latter feature microwave-rate spacings, achieving both in the same material platform has been challenging. Here, we leverage both strong Kerr nonlinearity and efficient electro-optic phase modulation available in the ultralow-loss thin-film lithium niobate photonic platform, to demonstrate a hybrid Kerr-electro-optic frequency comb with stabilized spacing. In our approach, a dissipative Kerr soliton is first generated, and then electro-optic division is used to realize a frequency comb with 2,589 comb lines spaced by 29.308 GHz and spanning 75.9 THz (588 nm) end-to-end. Further, we demonstrate electronic stabilization and control of the soliton spacing, naturally facilitated by our approach. The broadband, microwave-rate comb in this work overcomes the spacing-span tradeoff that exists in all integrated frequency comb sources, and paves the way towards chip-scale solutions for complex tasks such as laser spectroscopy covering multiple bands, micro- and millimeter-wave generation, and massively parallel optical communications. %B arXiv:2402.11669 %G eng %U https://arxiv.org/abs/2402.11669 %0 Journal Article %J arXiv:2401.16242 %D Submitted %T Integrated resonant electro-optic comb enabled by platform-agnostic laser integration %A Isaac Luntadila Lufungula %A Amirhassan Shams-Ansari %A Dylan Renaud %A Camiel Op de Beeck %A Stijn Cuyvers %A Stijn Poelman %A Maximilien Billet %A Gunther Roelkens %A Loncar, Marko %A Bart Kuyken %X The field of integrated photonics has significantly impacted numerous fields including communication, sensing, and quantum physics owing to the efficiency, speed, and compactness of its devices. However, the reliance on off-chip bulk lasers compromises the compact nature of these systems. While silicon photonics and III-V platforms have established integrated laser technologies, emerging demands for ultra-low optical loss, wider bandgaps, and optical nonlinearities necessitate other platforms. Developing integrated lasers on less mature platforms is arduous and costly due to limited throughput or unconventional process requirements. In response, we propose a novel platform-agnostic laser integration technique utilizing a singular design and process flow, applicable without modification to a diverse range of platforms. Leveraging a two-step micro-transfer printing method, we achieve nearly identical laser performance across platforms with refractive indices between 1.7 and 2.5. Experimental validation demonstrates strikingly similar laser characteristics between devices processed on lithium niobate and silicon nitride platforms. Furthermore, we showcase the integration of a laser with a resonant electro-optic comb generator on the thin-film lithium niobate platform, producing over 80 comb lines spanning 12 nm. This versatile technique transcends platform-specific limitations, facilitating applications like microwave photonics, handheld spectrometers, and cost-effective Lidar systems, across multiple platforms. %B arXiv:2401.16242 %G eng %U https://arxiv.org/abs/2401.16242 %0 Journal Article %J arXiv:2402.00363 %D Submitted %T Limitations in design and applications of ultra-small mode volume photonic crystals %A Rubaiya Emran %A Michelle Chalupnik %A Erik N. Knall %A Ralf Riedinger %A Cleaven Chia %A Loncar, Marko %X Ultra-small mode volume nanophotonic crystal cavities have been proposed as powerful tools for increasing coupling rates in cavity quantum electrodynamics systems. However, their adoption in quantum information applications remains elusive. In this work, we investigate possible reasons why, and analyze the impact of different low mode volume resonator design choices on their utility in quantum optics experiments. We analyze band structure features and loss rates of low mode volume bowtie cavities in diamond and demonstrate independent design control over cavity-emitter coupling strength and loss rates. Further, using silicon vacancy centers in diamond as exemplary emitters, we investigate the influence of placement imprecision. We find that the benefit on photon collection efficiency and indistinguishability is limited, while the fabrication complexity of ultra-small cavity designs increases substantially compared to conventional photonic crystals. We conclude that ultra-small mode volume designs are primarily of interest for dispersive spin-photon interactions, which are of great interest for future quantum networks. %B arXiv:2402.00363 %G eng %U https://arxiv.org/abs/2402.00363 %0 Journal Article %J https://arxiv.org/abs/2307.12167 %D Submitted %T Nonlinear Multi-Resonant Cavity Quantum Photonics Gyroscopes Quantum Light Navigation %A Mengdi Sun %A Lončar, Marko %A Vassilios Kovanis %A Lin, Zin %X We propose an on-chip all-optical gyroscope based on nonlinear multi-resonant cavity quantum photonics in thin film χ(2) resonators -- Quantum-Optic Nonlinear Gyro or QONG in short. The key feature of our gyroscope is co-arisal and co-accumulation of quantum correlations, nonlinear wave mixing and non-inertial signals, all inside the same sensor-resonator. We theoretically analyze the Fisher Information of our QONGs under fundamental quantum noise conditions. Using Bayesian optimization, we maximize the Fisher Information and show that ∼900× improvement is possible over the shot-noise limited linear gyroscope with the same footprint, intrinsic quality factors and power budget. %B https://arxiv.org/abs/2307.12167 %G eng %U https://arxiv.org/abs/2307.12167 %0 Journal Article %J https://arxiv.org/abs/2311.18135 %D Submitted %T On-Chip Backward Stimulated Brillouin Scattering in Lithium Niobate Waveguides %A Caique C. Rodrigues %A Nick J. Schilder %A Roberto O. Zurita %A Letícia S. Magalhães %A Amirhassan Shams-Ansari %A Thiago P. M. Alegre %A Lončar, Marko %A Gustavo S. Wiederhecker %X We report on the first experimental demonstration of backward stimulated Brillouin scattering (SBS) in Lithium Niobate on Insulator (LNOI) waveguides. Performing polarization-dependent pump-probe experiments, we successfully quantified both intramodal and intermodal scattering among fundamental modes, showcasing substantial gains up to GB=10m−1W−1. Such large gains on simple waveguides open a pathway for unlocking novel opto-electro-mechanical phenomena within the LNOI platform. %B https://arxiv.org/abs/2311.18135 %G eng %U https://arxiv.org/abs/2311.18135 %0 Journal Article %J arXiv:2402.16161 %D Submitted %T Twenty-nine million Intrinsic Q-factor Monolithic Microresonators on Thin Film Lithium Niobate %A Xinrui Zhu %A Yaowen Hu %A Shengyuan Lu %A Hana K. Warner %A Xudong Li %A Yunxiang Song %A Leticia Magalhaes %A Amirhassan Shams-Ansari %A Neil Sinclair %A Loncar, Marko %X The recent emergence of thin-film lithium niobate (TFLN) has extended the landscape of integrated photonics. This has been enabled by the commercialization of TFLN wafers and advanced nanofabrication of TFLN such as high-quality dry etching. However, fabrication imperfections still limit the propagation loss to a few dB/m, restricting the impact of this platform. Here, we demonstrate TFLN microresonators with a record-high intrinsic quality (Q) factor of twenty-nine million, corresponding to an ultra-low propagation loss of 1.3 dB/m. We present spectral analysis and the statistical distribution of Q factors across different resonator geometries. Our work pushes the fabrication limits of TFLN photonics to achieve a Q factor within one order of magnitude of the material limit. %B arXiv:2402.16161 %G eng %U https://arxiv.org/abs/2402.16161 %0 Journal Article %J https://arxiv.org/abs/2401.09655 %D Submitted %T Cavity-enhanced narrowband spectral filters using rare-earth ions doped in thin-film lithium niobate %A Zhao, Yuqi %A Dylan Renaud %A Farfurnik, Demitry %A Dutta, Subhojit %A Neil Sinclair %A Lončar, Marko %A Edo Waks %B https://arxiv.org/abs/2401.09655 %8 18 Jan, 2024 %G eng %U https://arxiv.org/abs/2401.09655 %0 Journal Article %J arXiv:2402.01153 %D Submitted %T Nanophotonic Phased Array XY Hamiltonian Solver %A Michelle Chalupnik %A Anshuman Singh %A James Leatham %A Loncar, Marko %A Moe Soltani %X Solving large-scale computationally hard optimization problems using existing computers has hit a bottleneck. A promising alternative approach uses physics-based phenomena to naturally solve optimization problems wherein the physical phenomena evolves to its minimum energy. In this regard, photonics devices have shown promise as alternative optimization architectures, benefiting from high-speed, high-bandwidth and parallelism in the optical domain. Among photonic devices, programmable spatial light modulators (SLMs) have shown promise in solving large scale Ising model problems to which many computationally hard problems can be mapped. Despite much progress, existing SLMs for solving the Ising model and similar problems suffer from slow update rates and physical bulkiness. Here, we show that using a compact silicon photonic integrated circuit optical phased array (PIC-OPA) we can simulate an XY Hamiltonian, a generalized form of Ising Hamiltonian, where spins can vary continuously. In this nanophotonic XY Hamiltonian solver, the spins are implemented using analog phase shifters in the optical phased array. The far field intensity pattern of the PIC-OPA represents an all-to-all coupled XY Hamiltonian energy and can be optimized with the tunable phase-shifters allowing us to solve an all-to-all coupled XY model. Our results show the utility of PIC-OPAs as compact, low power, and high-speed solvers for nondeterministic polynomial (NP)-hard problems. The scalability of the silicon PIC-OPA and its compatibility with monolithic integration with CMOS electronics further promises the realization of a powerful hybrid photonic/electronic non-Von Neumann compute engine. %B arXiv:2402.01153 %G eng %U https://arxiv.org/abs/2402.01153 %0 Journal Article %J arXiv:2403.01107 %D Submitted %T Octave-spanning Kerr soliton microcombs on thin-film lithium niobate %A Yunxiang Song %A Yaowen Hu %A Xinrui Zhu %A Yang, Ki Youl %A Loncar, Marko %X Dissipative Kerr solitons from optical microresonators, commonly referred to as soliton microcombs, have been developed for a broad range of applications, including precision measurement, optical frequency synthesis, and ultra-stable microwave and millimeter wave generation, all on a chip. An important goal for microcombs is self referencing, which requires octave-spanning bandwidths to detect and stabilize the comb carrier envelope offset frequency. Further, detection and locking of the comb spacings are often achieved using frequency division by electro-optic modulation. The thin-film lithium niobate photonic platform, with its low loss, strong second-order nonlinearity, and large Pockels effect, is ideally suited for these tasks. However, octave-spanning soliton microcombs are challenging to demonstrate on this platform, largely complicated by strong Raman effects hindering reliable fabrication of soliton devices. Here, we demonstrate entirely connected and octave-spanning soliton microcombs on thin-film lithium niobate. With appropriate control over microresonator free spectral range and dissipation spectrum, we show that soliton-inhibiting Raman effects are suppressed, and soliton devices are fabricated with near-unity yield. Our work offers an unambiguous method for soliton generation on strongly Raman-active materials. Further, it anticipates monolithically integrated, self-referenced frequency standards in conjunction with established technologies, such as periodically poled waveguides and electro-optic modulators, on thin-film lithium niobate. %B arXiv:2403.01107 %G eng %U https://arxiv.org/abs/2403.01107 %0 Journal Article %J arXiv %D Submitted %T On-chip synchronous pumped χ(3) optical parametric oscillator on thin-film lithium niobate %A Rebecca Cheng %A Mengjie Yu %A Amirhassan Shams-Ansari %A Yaowen Hu %A Christian Reimer %A Zhang, Mian %A Lončar, Marko %X Optical parametric oscillation (OPO) has widely been utilized as a means of generating light with wide spectral coverage from a single pump laser. These oscillators can be driven using either continuous-wave (CW) light, which only requires lining up of the pump frequency with OPO resonance, or pulsed light, which also mandates that the repetition rate of the pulse and free spectral range of the OPO cavity are carefully tuned to match each other. Advancements in nanophotonics have ignited interest in chip-scale OPOs, which enable low-footprint and high-efficiency solutions to broadband light generation. CW-pumped integrated OPO has been demonstrated using both χ(2) and χ(3) parametric oscillation. However, realizing pulse-driven on-chip OPO remains challenging, as microresonator cavities have limited tuning range in the FSR and resonance frequency compared to traditional bulk cavities. Here, we overcome this limitation and demonstrate a χ(3) pulse-driven OPO by using a tunable on-chip femtosecond pulse generator to synchronously pump the oscillator. The output frequency comb generated by our OPO has 30-GHz repetition rate, spans 2/5 of an octave and consists of over 1400 comb lines with a pump-to-comb conversion efficiency of 10%. %B arXiv %G eng %U https://arxiv.org/abs/2304.12878 %0 Journal Article %J Nanophotonics %D 2024 %T Bayesian optimization of Fisher Information in nonlinear multiresonant quantum photonics gyroscopes %A Mengdi Sun %A Vassilios Kovanis %A Lončar, Marko %A Lin, Zin %X We propose an on-chip gyroscope based on nonlinear multiresonant optics in a thin film χ (2) resonator that combines high sensitivity, compact form factor, and low power consumption simultaneously. We theoretically analyze a novel holistic metric – Fisher Information capacity of a multiresonant nonlinear photonic cavity – to fully characterize the sensitivity of our gyroscope under fundamental quantum noise conditions. Leveraging Bayesian optimization techniques, we directly maximize the nonlinear multiresonant Fisher Information. Our holistic optimization approach orchestrates a harmonious convergence of multiple physical phenomena – including noise squeezing, nonlinear wave mixing, nonlinear critical coupling, and noninertial signals – all encapsulated within a single sensor-resonator, thereby significantly augmenting sensitivity. We show that ∼ 470 × improvement is possible over the shot-noise limited linear gyroscope with the same footprint, intrinsic quality factors, and power budget. %B Nanophotonics %G eng %U https://doi.org/10.1515/nanoph-2024-0032 %N 2024-0032 %0 Journal Article %J Optics Express %D 2024 %T Relaxation of the electro-optic response in thin-film lithium niobate modulators %A Holzgrafe, Jeffrey %A Puma, Eric %A Rebecca Cheng %A Hana Warner %A Amirhassan Shams-Ansari %A Shankar, Raji %A Lončar, Marko %X

Thin-film lithium niobate (TFLN) is a promising electro-optic (EO) photonics platform with high modulation bandwidth, low drive voltage, and low optical loss. However, EO modulation in TFLN is known to relax on long timescales. Instead, thermo-optic heaters are often used for stable biasing, but heaters incur challenges with cross-talk, high power, and low bandwidth. Here, we characterize the low-frequency (1 mHz to 1 MHz) EO response of TFLN modulators, investigate the root cause of EO relaxation and demonstrate methods to improve bias stability. We show that relaxation-related effects can enhance EO modulation across a frequency band spanning 1kHz to 20kHz in our devices – a counter-intuitive result that can confound measurement of half-wave voltage  in TFLN modulators. We also show that EO relaxation can be slowed by more than 104-fold through control of the LN-metal interface and annealing, offering progress toward lifetime-stable EO biasing. Such robust EO biasing would enable applications for TFLN devices where cross-talk, power, and bias bandwidth are critical, such as quantum devices, high-density integrated photonics, and communications.

%B Optics Express %V 32 %P 3619 %G eng %U https://opg.optica.org/oe/fulltext.cfm?uri=oe-32-3-3619&id=545707 %0 Journal Article %J Phys. Rev. Applied %D 2024 %T Integrated Phononic Waveguides in Diamond %A Sophie Weiyi Ding %A Benjamin Pingault %A Shao, Linbo %A Neil Sinclair %A Bartholomeus Machielse %A Cleaven Chia %A Smarak Maity %A Lončar, Marko %X Efficient generation, guiding, and detection of phonons, or mechanical vibrations, are of interest in various fields including radio frequency communication, sensing, and quantum information. Diamond is an important platform for phononics because of the presence of strain-sensitive spin qubits, and its high Young's modulus which allows for low-loss gigahertz devices. We demonstrate a diamond phononic waveguide platform for generating, guiding, and detecting gigahertz-frequency surface acoustic wave (SAW) phonons. We generate SAWs using interdigital transducers integrated on AlN/diamond and observe SAW transmission at 4-5 GHz through both ridge and suspended waveguides, with wavelength-scale cross sections (~1 {\mu}m2) to maximize spin-phonon interaction. This work is a crucial step for developing acoustic components for quantum phononic circuits with strain-sensitive color centers in diamond. %B Phys. Rev. Applied %V 21 %P 014034 %G eng %U https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.21.014034 %0 Journal Article %J ACS Photonics %D 2024 %T Molybdenum Silicide Superconducting Nanowire Single-Photon Detectors on Lithium Niobate Waveguides %A Marco Colangelo %A Di Zhu %A Shao, Linbo %A Holzgrafe, Jeffrey %A Emma K. Batson %A Boris Desiatov %A Owen Medeiros %A Matthew Yeung %A Loncar, Marko %A Karl K. Berggren %X We demonstrate a molybdenum silicide superconducting nanowire single-photon detector heterogeneously integrated onto a thin-film lithium niobate waveguide. The detector achieves approximately 50% on-chip detection efficiency at 1550 nm with a jitter of 82 ps when measured at 0.78 K. This demonstration showcases the integration of an amorphous superconductor utilizing conventional fabrication processes without strict cooling and substrate requirements. This paves the way for the integration of additional superconducting electronic components, potentially realizing the full promise of integrated quantum photonic circuits. %B ACS Photonics %G eng %U https://doi.org/10.1021/acsphotonics.3c01628 %0 Journal Article %J PHYSICAL REVIEW APPLIED %D 2024 %T Development of a Boston-area 50-km fiber quantum network testbed %A Eric Bersin %A Matthew Grein %A Madison Sutula %A Ryan Murphy %A Yan Qi Huan %A Mark Stevens %A Aziza Suleymanzade %A Catherine Lee %A Ralf Riedinger %A David J Starling %A Pieter-Jan Stas %A Can M Knaut %A Neil Sinclair %A Daniel R Assumpcao %A Yan-Cheng Wei %A Erik N Knall %A David S Levonian %A Mihir K Bhaskar %A Lončar, Marko %A Scott Hamilton %A Lukin, Mikhail %A Dirk Englund %A P Benjamin Dixon %X Distributing quantum information between remote systems will necessitate the integration of emerging quantum components with existing communication infrastructure. This requires understanding the channel-induced degradations of the transmitted quantum signals, beyond the typical characterization methods for classical communication systems. Here we report on a comprehensive characterization of a Boston-Area Quantum Network (BARQNET) telecom fiber testbed, measuring the time-of-flight, polarization, and phase noise imparted on transmitted signals. We further design and demonstrate a compensation system that is both resilient to these noise sources and compatible with integration of emerging quantum memory components on the deployed link. These results have utility for future work on the BARQNET as well as other quantum network testbeds in development, enabling near-term quantum networking demonstrations and informing what areas of technology development will be most impactful in advancing future system capabilities. %B PHYSICAL REVIEW APPLIED %V 21 %P 014024 %G eng %U https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.5.010303 %0 Journal Article %J PRX Quantum %D 2024 %T Telecom networking with a diamond quantum memory %A Eric Bersin %A Madison Sutula %A Yan Qi Huan %A Aziza Suleymanzade %A Daniel R Assumpcao %A Yan-Cheng Wei %A Pieter-Jan Stas %A Can M Knaut %A Erik N Knall %A Carsten Langrock %A Neil Sinclair %A Ryan Murphy %A Ralf Riedinger %A Matthew Yeh %A CJ Xin %A Saumil Bandyopadhyay %A Denis D Sukachev %A Bartholomeus Machielse %A David S Levonian %A Mihir K Bhaskar %A Scott Hamilton %A Park, Hongkun %A Lončar, Marko %A Martin M Fejer %A P Benjamin Dixon %A Dirk R Englund %A Mikhail D. Lukin %X Practical quantum networks require interfacing quantum memories with existing channels and systems that operate in the telecom band. Here we demonstrate low-noise, bidirectional quantum frequency conversion that enables a solid-state quantum memory to directly interface with telecom-band systems. In particular, we demonstrate conversion of visible-band single photons emitted from a silicon-vacancy (SiV) center in diamond to the telecom O-band, maintaining low noise (g2(0)<0.1) and high indistinguishability (V=89±8%). We further demonstrate the utility of this system for quantum networking by converting telecom-band time-bin pulses, sent across a lossy and noisy 50 km deployed fiber link, to the visible band and mapping their quantum states onto a diamond quantum memory with fidelity =87±2.5%. These results demonstrate the viability of SiV quantum memories integrated with telecom-band systems for scalable quantum networking applications. %B PRX Quantum %V 5 %P 010303 %G eng %U https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.5.010303 %0 Journal Article %J Applied Physics Letters %D 2023 %T Deterministic Creation of Strained Color Centers in Nanostructures via High-Stress Thin Films %A Daniel R Assumpcao %A Chang Jin %A Madison Sutula %A Sophie W Ding %A Phong Pham %A Can M Knaut %A Mihir K Bhaskar %A Abishrant Panday %A Aaron M Day %A Dylan Renaud %A Mikhail D. Lukin %A Hu, Evelyn %A Bartholomeus Machielse %A Loncar, Marko %X Color centers have emerged as a leading qubit candidate for realizing hybrid spin-photon quantum information technology. One major limitation of the platform, however, is that the characteristics of individual color-centers are often strain dependent. As an illustrative case, the silicon-vacancy center in diamond typically requires millikelvin temperatures in order to achieve long coherence properties, but strained silicon vacancy centers have been shown to operate at temperatures beyond 1K without phonon-mediated decoherence. In this work we combine high-stress silicon nitride thin films with diamond nanostructures in order to reproducibly create statically strained silicon-vacancy color centers (mean ground state splitting of 608 GHz) with strain magnitudes of ∼4×10−4. Based on modeling, this strain should be sufficient to allow for operation of a majority silicon-vacancy centers within the measured sample at elevated temperatures (1.5K) without any degradation of their spin properties. This method offers a scalable approach to fabricate high-temperature operation quantum memories. Beyond silicon-vacancy centers, this method is sufficiently general that it can be easily extended to other platforms as well. %B Applied Physics Letters %V 123 %8 Dec 2023 %G eng %U https://pubs.aip.org/aip/apl/article/123/24/244001/2928883 %N 24 %0 Journal Article %J APL Photonics %D 2023 %T Supercontinuum generation by saturated second-order nonlinear interactions %A Marc Jankowski %A Carsten Langrock %A Boris Desiatov %A Loncar, Marko %A MM Fejer %X We propose a new approach to supercontinuum generation and carrier-envelope-offset detection based on saturated second-order nonlinear interactions in dispersion-engineered nanowaveguides. The technique developed here broadens the interacting harmonics by forming stable bifurcations of the pulse envelopes due to an interplay between phase-mismatch and pump depletion. We first present an intuitive heuristic model for spectral broadening by second-harmonic generation of femtosecond pulses and show that this model agrees well with experiments. Then, having established strong agreement between theory and experiment, we develop scaling laws that determine the energy required to generate an octave of bandwidth as a function of input pulse duration, device length, and input pulse chirp. These scaling laws suggest that future realization based on this approach could enable supercontinuum generation with orders of magnitude less energy than current state-of-the-art devices. %B APL Photonics %V 8 %P 116104 %G eng %U https://pubs.aip.org/aip/app/article/8/11/116104/2919649 %N 11 %0 Journal Article %J Applied Physics Letters %D 2023 %T Cryogenic packaging of nanophotonic devices with a low coupling loss <1 dB %A Beibei Zeng %A Chawina De-Eknamkul %A Daniel Assumpcao %A Dylan Renaud %A Zhuoxian Wang %A Daniel Riedel %A Jeonghoon Ha %A Carsten Robens %A David Levonian %A Lukin, Mikhail %A Ralf Riedinger %A Mihir Bhaskar %A Sukachev, Denis %A Loncar, Marko %A Bart Machielse %X Robust, low-loss photonic packaging of on-chip nanophotonic circuits is a key enabling technology for the deployment of integrated photonics in a variety of classical and quantum technologies including optical communications and quantum communications, sensing, and transduction. To date, no process has been established that enables permanent, broadband, and cryogenically compatible coupling with sub-dB losses from optical fibers to nanophotonic circuits. Here, we report a technique for reproducibly generating a permanently packaged interface between a tapered optical fiber and nanophotonic devices on diamond with a record-low coupling loss <1 dB per facet at near-infrared wavelengths (∼730 nm) that remains stable from 300 K to 30 mK. We further demonstrate the compatibility of this technique with etched lithium niobate on insulator waveguides. The technique lifts performance limitations imposed by scattering as light transfers between photonic devices and optical fibers, paving the way for scalable integration of photonic technologies at both room and cryogenic temperatures. %B Applied Physics Letters %V 123 %P 161106 %G eng %U https://pubs.aip.org/aip/apl/article/123/16/161106/2916952/Cryogenic-packaging-of-nanophotonic-devices-with-a %0 Journal Article %J Nature Photonics %D 2023 %T Integrated Electro-Optic Isolator on Thin Film Lithium Niobate %A Mengjie Yu %A Rebecca Cheng %A Christian Reimer %A Lingyan He %A Kevin Luke %A Puma, Eric %A Shao, Linbo %A Amirhassan Shams-Ansari %A Hannah R. Grant %A Leif Johansson %A Zhang, Mian %A Lončar, Marko %X Optical isolator is an indispensable component of almost any optical system and is used to protect a laser from unwanted reflections for phase-stable coherent operation. The development of chip-scale optical systems, powered by semiconductor lasers integrated on the same chip, has resulted in a need for a fully integrated optical isolator. However, conventional approaches based on application of magneto-optic materials to break the reciprocity and provide required isolation have significant challenges in terms of material processing and insertion loss. As a result, many magnetic-free approaches have been explored, including acousto-optics, optical nonlinearity, and electro-optics. However, to date, the realization of an integrated isolator with low insertion loss, high isolation ratio, broad bandwidth, and low power consumption on a monolithic material platform is still absent. Here we realize non-reciprocal traveling-wave EO-based isolator on thin-film LN, enabling maximum optical isolation of 48 dB and an on-chip insertion loss of 0.5 dB using a single-frequency microwave drive at 21-dBm RF power. The isolation ratio is verified to be larger than 37 dB across a tunable optical wavelength range from 1510 to 1630 nm. We verify that our hybrid DFB laser - LN isolator module successfully protects the single-mode operation and the linewidth of the DFB laser from reflection. Our result is a significant step towards a practical high-performance optical isolator on chip. %B Nature Photonics %G eng %U https://www-nature-com.ezp-prod1.hul.harvard.edu/articles/s41566-023-01227-8 %0 Journal Article %J APL Photonics %D 2023 %T Scalable and ultralow power silicon photonic two-dimensional phased array %A Michelle Chalupnik %A Anshuman Singh %A James Leatham %A Lončar, Marko %A Moe Soltani %X Photonic integrated circuit based optical phased arrays (PIC-OPAs) are emerging as promising programmable processors and spatial light modulators, combining the best of planar and free-space optics. Their implementation on silicon photonic platforms has been especially fruitful. Despite much progress in this field, demonstrating steerable two-dimensional (2D) OPAs that are scalable to a large number of array elements and operate with a single wavelength has proven a challenge. In addition, the phase shifters used in the array for programming the far-field beam are either power hungry or have a large footprint, preventing the implementation of large scale 2D arrays. Here, we demonstrate a two-dimensional silicon photonic phased array with high-speed (∼330 kHz) and ultralow power microresonator phase-shifters with a compact radius (∼3 µm) and 2π phase shift ability. Each phase-shifter consumes an average of ∼250 µW of static power for resonance alignment and ∼50 µW of power for far-field beamforming, a more than one order of magnitude improvement compared to prior OPA works based on waveguide-based thermo-optic phase shifters. Such PIC-OPA devices can enable a new generation of compact and scalable low power processors and sensors %B APL Photonics %V 8 %P 051305 %G eng %U https://pubs.aip.org/aip/app/article/8/5/051305/2893498 %0 Journal Article %J Nature Communications %D 2023 %T Sub-1 Volt and High-Bandwidth Visible to Near-Infrared Electro-Optic Modulators %A Dylan Renaud %A Daniel Rimoli Assumpcao %A Graham Joe %A Amirhassan Shams-Ansari %A Di Zhu %A Yaowen Hu %A Neil Sinclair %A Loncar, Marko %B Nature Communications %V 14 %P 1496 %G eng %U https://www.nature.com/articles/s41467-023-36870-w %0 Journal Article %J ACS Nano %D 2023 %T The bulk van der Waals layered magnet CrSBr is a quasi-1D quantum material %A Julian Klein %A Benjamin Pingault %A Matthias Florian %A Marie-Christin Heißenbüttel %A Alexander Steinhoff %A Zhigang Song %A Kierstin Torres %A Florian Dirnberger %A Jonathan B. Curtis %A Thorsten Deilmann %A Rami Dana %A Rezlind Bushati %A Jiamin Quan %A Jan Luxa %A Zdenek Sofer %A Andrea Alù %A Vinod M. Menon %A Ursula Wurstbauer %A Michael Rohlfing %A Narang, Prineha %A Lončar, Marko %A Frances M. Ross %X Correlated quantum phenomena in one-dimensional (1D) systems that exhibit competing electronic and magnetic orders are of fundamental interest. Interaction effects in low-dimensional systems can lead to fundamental excitations which are completely different from the quasi-particles one would expect in a higher-dimensional counterpart, such as Tomonaga-Luttinger liquids and topological orders and defects. However, clean 1D electronic systems are difficult to realize experimentally, particularly magnetically ordered systems. Here, we show that the van der Waals layered magnetic semiconductor CrSBr behaves like a quasi-1D electronic material embedded in a magnetically ordered environment. The strong 1D electronic character is due to the unique combination of weak interlayer hybridization and anisotropy in effective mass and dielectric screening. The band structure and quasi-particle excitations are dominated by the Cr-S chains and a shallow 1D quantum confinement normal to these chains, manifesting in an anisotropic band with an effective electron mass ratio of meX/meY∼50. Strong quasi-particle interactions and 1D electronic character are indicated by Fano resonances from a van Hove singularity of similar strength as in metallic carbon nanotubes. The spectrally narrow excitons (1 meV) inherit the 1D character and show pronounced exciton-phonon coupling effects. Overall, CrSBr appears to be an experimentally clean candidate for the study of 1D correlated many-body physics in the presence of magnetic order. %B ACS Nano %V 17 %P 5316-5328 %8 May 2022 %G eng %U https://pubs.acs.org/doi/abs/10.1021/acsnano.2c07316 %N 6 %0 Journal Article %J IEEE Journal of Quantum Electronics %D 2023 %T Picosecond Synchronization of Photon Pairs through a Fiber Link between Fermilab and Argonne National Laboratories %A Keshav Kapoor %A Si Xie %A Joaquin Chung %A Raju Valivarthi %A Cristián Peña %A Lautaro Narváez %A Neil Sinclair %A Jason P. Allmaras %A Andrew D. Beyer %A Samantha I. Davis %A Gabriel Fabre %A George Iskander %A Gregory S. Kanter %A Rajkumar Kettimuthu %A Boris Korzh %A Prem Kumar %A Nikolai Lauk %A Andrew Mueller %A Matthew Shaw %A Panagiotis Spentzouris %A Maria Spiropulu %A Jordan M. Thomas %A Emma E. Wollman %B IEEE Journal of Quantum Electronics %V 59 %G eng %U https://ieeexplore.ieee.org/abstract/document/10032124 %N 4 %0 Journal Article %J Nature Communications %D 2023 %T Terahertz waveform synthesis from integrated lithium niobate circuits %A Alexa Herter %A Amirhassan Shams-Ansari %A Francesca Fabiana Settembrini %A Hana K. Warner %A Jérôme Faist %A Lončar, Marko %A Ileana-Cristina Benea-Chelmus %X Bridging the "terahertz (THz) gap" relies upon synthesizing arbitrary waveforms in the THz domain enabling applications that require both narrow band sources for sensing and few-cycle drives for classical and quantum objects. However, realization of custom-tailored waveforms needed for these applications is currently hindered due to limited flexibility for optical rectification of femtosecond pulses in bulk crystals. Here, we experimentally demonstrate that thin-film lithium niobate (TFLN) circuits provide a versatile solution for such waveform synthesis through combining the merits of complex integrated architectures, low-loss distribution of pump pulses on-chip, and an efficient optical rectification. Our distributed pulse phase-matching scheme grants shaping the temporal, spectral, phase, amplitude, and farfield characteristics of the emitted THz field through designer on-chip components. This strictly circumvents prior limitations caused by the phase-delay mismatch in conventional systems and relaxes the requirement for cumbersome spectral pre-engineering of the pumping light. We provide a toolbox of basic blocks that produce broadband emission up to 680 GHz with adaptable phase and coherence properties by using near-infrared pump pulse energies below 100 pJ. %B Nature Communications %V 14 %P 11 %8 Apr 2022 %G eng %U https://www.nature.com/articles/s41467-022-35517-6 %0 Journal Article %J ACS Nano %D 2023 %T Sensing the local magnetic environment through optically active defects in a layered magnetic semiconductor %A Julian Klein %A Zhigang Song %A Benjamin Pingault %A Florian Dirnberger %A Hang Chi %A Jonathan B. Curtis %A Rami Dana %A Rezlind Bushati %A Jiamin Quan %A Lukas Dekanovsky %A Zdenek Sofer %A Andrea Alù %A Vinod M. Menon %A Jagadeesh S. Moodera %A Lončar, Marko %A Narang, Prineha %A Frances M. Ross %X Atomic-level defects in van der Waals (vdW) materials are essential building blocks for quantum technologies and quantum sensing applications. The layered magnetic semiconductor CrSBr is an outstanding candidate for exploring optically active defects owing to a direct gap in addition to a rich magnetic phase diagram including a recently hypothesized defect-induced magnetic order at low temperature. Here, we show optically active defects in CrSBr that are probes of the local magnetic environment. We observe spectrally narrow (1 meV) defect emission in CrSBr that is correlated with both the bulk magnetic order and an additional low temperature defect-induced magnetic order. We elucidate the origin of this magnetic order in the context of local and non-local exchange coupling effects. Our work establishes vdW magnets like CrSBr as an exceptional platform to optically study defects that are correlated with the magnetic lattice. We anticipate that controlled defect creation allows for tailor-made complex magnetic textures and phases with the unique ingredient of direct optical access. %B ACS Nano %V 17 %P 288-299 %8 6 Jul 2022 %G eng %U https://pubs.acs.org/doi/10.1021/acsnano.2c07655 %N 1 %0 Journal Article %J Physical Review Applied %D 2022 %T Improved heralded single-photon source with a photon-number-resolving superconducting nanowire detector %A Samantha I. Davis %A Andrew Mueller %A Raju Valivarthi %A Nikolai Lauk %A Lautaro Narváez %A Boris Korzh %A Andrew D. Beyer %A Olmo Cerri %A Marco Colangelo %A Karl K. Berggren %A Matthew D. Shaw %A Si Xie %A Neil Sinclair %A Maria Spiropulu %B Physical Review Applied %V 18 %P 064007 %G eng %U https://doi.org/10.1103/PhysRevApplied.18.064007 %0 Journal Article %J Physical Review Applied %D 2022 %T Thermal Modulation of Gigahertz Surface Acoustic Waves on Lithium Niobate %A Shao, Linbo %A Ding, Sophie W. %A Yunwei Ma %A Yuhao Zhang %A Neil Sinclair %A Loncar, Marko %X Surface-acoustic-wave (SAW) devices have a wide range of applications in microwave signal processing. Microwave SAW components benefit from higher quality factors and much smaller crosstalk when compared to their electromagnetic counterparts. Efficient routing and modulation of SAWs are essential for building large-scale and versatile acoustic wave circuits. Here, we demonstrate integrated thermoacoustic modulators using two SAW platforms: bulk lithium niobate and thin-film lithium niobate on sapphire. In both approaches, the gigahertz-frequency SAWs are routed by integrated acoustic waveguides, while on-chip microheaters are used to locally change the temperature, and thus, control the phase of the SAW. Using this approach, we achieve phase changes of over 720° with the responsibility of 2.6°/mW for bulk lithium niobate and 0.52°/mW for lithium niobate on sapphire. Furthermore, we demonstrate amplitude modulation of SAWs using acoustic Mach-Zehnder interferometers. Our thermoacoustic modulators can enable reconfigurable acoustic signal processing for next-generation wireless communications and microwave systems. %B Physical Review Applied %G eng %U https://journals-aps-org.ezp-prod1.hul.harvard.edu/prapplied/abstract/10.1103/PhysRevApplied.18.054078 %N 18 %0 Journal Article %J Nature, Light: science & applications %D 2022 %T Spectral control of nonclassical light using an integrated thin-film lithium niobate modulator %A Di Zhu %A Changchen Chen %A Mengjie Yu %A Shao, Linbo %A Yaowen Hu %A C. J. Xin %A Matthew Yeh %A Ghosh, Soumya %A Lingyan He %A Christian Reimer %A Neil Sinclair %A Franco N. C. Wong %A Zhang, Mian %A Loncar, Marko %X Manipulating the frequency and bandwidth of nonclassical light is essential for implementing frequency-encoded/multiplexed quantum computation, communication, and networking protocols, and for bridging spectral mismatch among various quantum systems. However, quantum spectral control requires a strong nonlinearity mediated by light, microwave, or acoustics, which is challenging to realize with high efficiency, low noise, and on an integrated chip. Here, we demonstrate both frequency shifting and bandwidth compression of heralded single-photon pulses using an integrated thin-film lithium niobate (TFLN) phase modulator. We achieve record-high electro-optic frequency shearing of telecom single photons over terahertz range (±641 GHz or ±5.2 nm), enabling high visibility quantum interference between frequency-nondegenerate photon pairs. We further operate the modulator as a time lens and demonstrate over eighteen-fold (6.55 nm to 0.35 nm) bandwidth compression of single photons. Our results showcase the viability and promise of on-chip quantum spectral control for scalable photonic quantum information processing. %B Nature, Light: science & applications %P 327 %G eng %U https://www.nature.com/articles/s41377-022-01029-7 %N 11 %0 Journal Article %J Nature %D 2022 %T Femtosecond Pulse Generation via an Integrated Electro-Optic Time Lens %A Mengjie Yu %A David Barton %A Rebecca Cheng %A Christian Reimer %A Prashanta Kharel %A Lingyan He %A Shao, Linbo %A Di Zhu %A Yaowen Hu %A Hannah R. Grant %A Leif Johansson %A Yoshitomo Okawachi %A Alexander L. Gaeta %A Zhang, Mian %A Lončar, Marko %X Integrated femtosecond pulse and frequency comb sources are critical components for a wide range of applications, including optical atomic clocks1, microwave photonics2, spectroscopy3, optical wave synthesis4, frequency conversion5, communications6, lidar7, optical computing8 and astronomy9. The leading approaches for on-chip pulse generation rely on mode-locking inside microresonators with either third-order nonlinearity10 or with semiconductor gain11,12. These approaches, however, are limited in noise performance, wavelength and repetition rate tunability 10,13. Alternatively, subpicosecond pulses can be synthesized without mode-locking, by modulating a continuous-wave single-frequency laser using electro-optic modulators1,14,15,16,17. Here we demonstrate a chip-scale femtosecond pulse source implemented on an integrated lithium niobate photonic platform18, using cascaded low-loss electro-optic amplitude and phase modulators and chirped Bragg grating, forming a time-lens system19. The device is driven by a continuous-wave distributed feedback laser chip and controlled by a single continuous-wave microwave source without the need for any stabilization or locking. We measure femtosecond pulse trains (520-femtosecond duration) with a 30-gigahertz repetition rate, flat-top optical spectra with a 10-decibel optical bandwidth of 12.6 nanometres, individual comb-line powers above 0.1 milliwatts, and pulse energies of 0.54 picojoules. Our results represent a tunable, robust and low-cost integrated pulsed light source with continuous-wave-to-pulse conversion efficiencies an order of magnitude higher than those achieved with previous integrated sources. Our pulse generator may find applications in fields such as ultrafast optical measurement19,20 or networks of distributed quantum computers21,22. %B Nature %V 612 %P 252–258 %G eng %U https://www.nature.com/articles/s41586-022-05345-1 %0 Journal Article %J IEEE Transactions on Quantum Engineering %D 2022 %T Design and Implementation of the Illinois Express Quantum Metropolitan Area Network %A Joaquin Chung %A Ely M. Eastman %A Gregory S. Kanter %A Keshav Kapoor %A Nikolai Lauk %A Cristián H. Peña %A Robert K. Plunkett %A Neil Sinclair %A Jordan M. Thomas %A Raju Valivarthi %A Si Xie %A Rajkumar Kettimuthu %A Prem Kumar %A Panagiotis Spentzouris %A Maria Spiropulu %B IEEE Transactions on Quantum Engineering %V 3 %G eng %U https://ieeexplore.ieee.org/abstract/document/9946408 %0 Journal Article %J Science %D 2022 %T Robust multi-qubit quantum network node with integrated error detection %A Pieter-Jan Stas %A Yan Qi Huan %A Bartholomeus Machielse %A Erik N. Knall %A Aziza Suleymanzade %A Benjamin Pingault %A Madison Sutula %A Ding, Sophie W. %A Can M. Knaut %A Daniel R. Assumpcao %A Yan-Cheng Wei %A Mihir K. Bhaskar %A Ralf Riedinger %A Denis D. Sukachev %A Park, Hongkun %A Lončar, Marko %A David S. Levonian %A Mikhail D. Lukin %X Long-distance quantum communication and networking require quantum memory nodes with efficient optical interfaces and long memory times. We report the realization of an integrated two-qubit network node based on silicon-vacancy centers (SiVs) in diamond nanophotonic cavities. Our qubit register consists of the SiV electron spin acting as a communication qubit and the strongly coupled silicon-29 nuclear spin acting as a memory qubit with a quantum memory time exceeding 2 seconds. By using a highly strained SiV, we realize electron-photon entangling gates at temperatures up to 1.5 kelvin and nucleus-photon entangling gates up to 4.3 kelvin. We also demonstrate efficient error detection in nuclear spin–photon gates by using the electron spin as a flag qubit, making this platform a promising candidate for scalable quantum repeaters. %B Science %V 378 %P 557-560 %8 26 Jul 2022 %G eng %U https://www.science.org/doi/10.1126/science.add9771 %N 6619 %0 Journal Article %J Nature Communications %D 2022 %T Mirror-induced reflection in the frequency domain %A Yaowen Hu %A Mengjie Yu %A Neil Sinclair %A Di Zhu %A Rebecca Cheng %A Wang, Cheng %A Loncar, Marko %B Nature Communications %V 13 %P 6293 %G eng %U https://www.nature.com/articles/s41467-022-33529-w %0 Journal Article %J Optics Express %D 2022 %T Optical bi-stability in cubic silicon carbide microring resonators %A Keith Powell %A Jianfu Wang %A Amirhassan Shams-Ansari %A Bin-Kai Liao %A Debin Meng %A Neil Sinclair %A Liwei Li %A Jiangdong Deng %A Lončar, Marko %A Xiaoke Yi %X We measure the photothermal nonlinear response in suspended cubic silicon carbide (3C-SiC) and 3C-SiC-on-insulator (SiCOI) microring resonators. Bi-stability and thermo-optic hysteresis is observed in both types of resonators, with the suspended resonators showing a stronger response. A photothermal nonlinear index of 4.02×10−15 m2/W is determined for the suspended resonators, while the SiCOI resonators demonstrate one order of magnitude lower photothermal nonlinear index of 4.32×10−16 m2/W. Cavity absorption and temperature analysis suggest that the differences in thermal bi-stability are due to variations in waveguide absorption, likely from crystal defect density differences throughout the epitaxially grown layers. Furthermore, coupled mode theory model shows that the strength of the optical bi-stability, in suspended and SiCOI resonators can be engineered for high power or nonlinear applications. %B Optics Express %V 30 %P 34149-34158 %G eng %U https://opg.optica.org/oe/fulltext.cfm?uri=oe-30-19-34149&id=498614 %N 19 %0 Journal Article %J Nature Photonics %D 2022 %T High-efficiency and broadband on-chip electro-optic frequency combs generators %A Yaowen Hu %A Mengjie Yu %A Brandon Buscaino %A Neil Sinclair %A Di Zhu %A Rebecca Cheng %A Amirhassan Shams-Ansari %A Shao, Linbo %A Zhang, Mian %A Joseph M. Kahn %A Loncar, Marko %X Developments in integrated photonics have led to stable, compact and broadband comb generators that support a wide range of applications including communications1, ranging2, spectroscopy3, frequency metrology4, optical computing5,6 and quantum information7,8. Broadband optical frequency combs can be generated in electro-optical cavities, where light passes through a phase modulator multiple times while circulating in an optical resonator9,10,11,12. However, broadband electro-optic frequency combs are currently limited by low conversion efficiencies. Here we demonstrate an integrated electro-optic frequency comb with a conversion efficiency of 30% and an optical span of 132 nm, based on a coupled-resonator platform on thin-film lithium niobate13. We further show that, enabled by the high efficiency, the device acts as an on-chip femtosecond pulse source (336 fs pulse duration), which is important for applications in nonlinear optics, sensing and computing. As an example, in the ultrafast and high-power regime, we demonstrate a frequency comb with simultaneous electro-optic and third-order nonlinearity effects. Our device paves the way for practical optical frequency comb generators and provides a platform to investigate new regimes of optical physics that simultaneously involve multiple nonlinearities. %B Nature Photonics %V 16 %P 679 %G eng %U https://www.nature.com/articles/s41566-022-01059-y %0 Journal Article %J Photonics Research %D 2022 %T Systematic Investigation of Millimeter-Wave Optic Modulation Performance in Thin-Film Lithium Niobate %A Yiwen Zhang %A Shao, Linbo %A Jingwei Yang %A Zhaoxi Chen %A Zhang, Ke %A Kam-Man Shum %A Di Zhu %A Chi Hou Chan %A Loncar, Marko %A Wang, Cheng %X Millimeter-wave (mmWave) band (30 - 300 GHz) is an emerging spectrum range for wireless communication, short-range radar and sensor applications. mmWave-optic modulators that could efficiently convert mmWave signals into optical domain are crucial components for long-haul transmission of mmWave signals through optical networks. At these ultrahigh frequencies, however, the modulation performances are highly sensitive to the transmission line loss as well as the velocity- and impedance-matching conditions, while precise measurements and modeling of these parameters are often non-trivial. Here we present a systematic investigation of the mmWave-optic modulation performances of thin-film lithium niobate modulators through theoretical modeling, electrical verifications and electro-optic measurements at frequencies up to 325 GHz. Based on our experimentally verified model, we demonstrate thin-film lithium niobate mmWave-optic modulators with a measured 3-dB electro-optic bandwidth of 170 GHz and a 6-dB bandwidth of 295 GHz. The device also shows a low RF half-wave voltage of 7.3 V measured at an ultrahigh modulation frequency of 250 GHz. This work provides a comprehensive guideline for the design and characterization of mmWave-optic modulators and paves the way toward future integrated mmWave photonic systems for beyond-5G communication and radar applications. %B Photonics Research %V 10 %P 2380-2387 %8 5 Jul, 2022 %G eng %U https://opg.optica.org/prj/fulltext.cfm?uri=prj-10-10-2380&id=507393 %N 10 %0 Journal Article %J Journal of Lightwave Technology %D 2022 %T Picosecond synchronization system for quantum networks %A Raju Valivarthi %A Lautaro Narváez %A Samantha I. Davis %A Nikolai Lauk %A Cristián Peña %A Si Xie %A Jason P. Allmaras %A Andrew D. Beyer %A Boris Korzh %A Andrew Mueller %A Mandy Rominsky %A Matthew D. Shaw %A Emma E. Wollman %A Panagiotis Spentzouris %A Daniel Oblak %A Neil Sinclair %A Maria Spiropulu %B Journal of Lightwave Technology %P 1-7 %G eng %U 10.1109/JLT.2022.3194860 %0 Journal Article %J Physical Review Letters %D 2022 %T Efficient Source of Shaped Single Photons Based on an Integrated Diamond Nanophotonic System %A Erik N. Knall %A Can M. Knaut %A Rivka Bekenstein %A Daniel R. Assumpcao %A Pavel L. Stroganov %A Wenjie Gong %A Yan Qi Huan %A Pieter-Jan Stas %A Bartholomeus Machielse %A Michelle Chalupnik %A David Levonian %A Aziza Suleymanzade %A Ralf Riedinger %A Park, Hongkun %A Lončar, Marko %A Mihir K. Bhaskar %A Mikhail D. Lukin %B Physical Review Letters %V 129 %P 053603 %G eng %U https://journals-aps-org.ezp-prod1.hul.harvard.edu/prl/abstract/10.1103/PhysRevLett.129.053603 %0 Journal Article %J APL Photonics %D 2022 %T Reduced Material Loss in Thin-film Lithium Niobate Waveguides %A Amirhassan Shams-Ansari %A Guanhao Huang %A Lingyan He %A Zihan Li %A Holzgrafe, Jeffrey %A Marc Jankowski %A Mikhail Churaev %A Prashanta Kharel %A Rebecca Cheng %A Di Zhu %A Neil Sinclair %A Boris Desiatov %A Zhang, Mian %A Tobias J. Kippenberg %A Lončar, Marko %X Thin-film lithium niobate has shown promise for scalable applications ranging from single-photon sources to high-bandwidth data communication systems.
Realization of the next generation high-performance classical and quantum devices, however, requires much lower optical losses than the current state of the art (~10 million). Unfortunately, material limitations of ion-sliced thin film lithium niobate have not been explored, and therefore it is unclear how high quality factor  can be achieved in this platform. Here we evaluate the material limited quality factor of thin film lithium niobate photonic platform can be as high as Q~108 at telecommunication wavelengths, corresponding to a propagation loss of 0.2 dB/m. %B APL Photonics %G eng %U https://aip.scitation.org/doi/10.1063/5.0095146 %0 Journal Article %J Nature Electronics %D 2022 %T Electrical Control of Surface Acoustic Waves %A Shao, Linbo %A Di Zhu %A Marco Colangelo %A Dae Hun Lee %A Neil Sinclair %A Yaowen Hu %A Peter T. Rakich %A Lai, Keji %A Karl K. Berggren %A Loncar, Marko %B Nature Electronics %8 5 Jan 2021 %G eng %U https://www.nature.com/articles/s41928-022-00773-3 %0 Journal Article %J Optics Letters %D 2022 %T Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate %A C. J. Xin %A Jatadhari Mishra %A Changchen Chen %A Di Zhu %A Amirhassan Shams-Ansari %A Carsten Langrock %A Neil Sinclair %A Franco N. C. Wong %A M. M. Fejer %A Lončar, Marko %X Existing nonlinear-optic implementations of pure, unfiltered heralded single-photon sources do not offer the scalability required for densely integrated quantum networks. Additionally, lithium niobate has hitherto been unsuitable for such use due to its material dispersion. We engineer the dispersion and the quasi-phasematching conditions of a waveguide in the rapidly emerging thin-film lithium niobate platform to generate spectrally separable photon pairs in the telecommunications band. Such photon pairs can be used as spectrally pure heralded single-photon sources in quantum networks. We estimate a heralded-state spectral purity of >94% based on joint spectral intensity measurements. Further, a joint spectral phase-sensitive measurement of the unheralded time-integrated second-order correlation function yields a heralded-state purity of (86±5)%. %B Optics Letters %V 47 %P 2830-2833 %G eng %U https://doi.org/10.1364/OL.456873 %N 11 %0 Journal Article %J Physical Review Letters %D 2022 %T Optical Entanglement of Distinguishable Quantum Emitters %A D. S. Levonian %A R. Riedinger %A B. Machielse %A E. N. Knall %A M. K. Bhaskar %A C. M. Knaut %A R. Bekenstein %A H. Park %A Lončar, M. %A M. D. Lukin %X Solid-state quantum emitters are promising candidates for the realization of quantum networks, owing to their long-lived spin memories, high-fidelity local operations, and optical connectivity for long-range entanglement. However, due to differences in local environment, solid-state emitters typically feature a range of distinct transition frequencies, which makes it challenging to create optically mediated entanglement between arbitrary emitter pairs. We propose and demonstrate an efficient method for entangling emitters with optical transitions separated by many linewidths. In our approach, electro-optic modulators enable a single photon to herald a parity measurement on a pair of spin qubits. We experimentally demonstrate the protocol using two silicon-vacancy centers in a diamond nanophotonic cavity, with optical transitions separated by 7.4 GHz. Working with distinguishable emitters allows for individual qubit addressing and readout, enabling parallel control and entanglement of both colocated and spatially separated emitters, a key step toward scaling up quantum information processing systems. %B Physical Review Letters %V 128 %G eng %U https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.128.213602 %N 213602 %0 Journal Article %J Photonics Research %D 2022 %T High-performance modified uni-traveling carrier photodiode integrated on a thin-film lithium niobate platform %A Xiangwen Guo %A Shao, Linbo %A Lingyan He %A Kevin Luke %A Jesse Morgan %A Keye Sun %A Junyi Gao %A Ta-Ching Tzu %A Shen, Yang %A Dekang Chen %A Bingtian Guo %A Fengxin Yu %A Qianhuan Yu %A Masoud Jafari %A Loncar, Marko %A Zhang, Mian %A Andreas Beling %X Lithium niobate on insulator (LNOI) has become an intriguing platform for integrated photonics for applications in communications, microwave photonics, and computing. Whereas, integrated devices including modulators, resonators, and lasers with high performance have been recently realized on the LNOI platform, high-speed photodetectors, an essential building block in photonic integrated circuits, have not been demonstrated on LNOI yet. Here, we demonstrate for the first time, heterogeneously integrated modified uni-traveling carrier photodiodes on LNOI with a record-high bandwidth of 80 GHz and a responsivity of 0.6 A/W at a 1550-nm wavelength. The photodiodes are based on an n-down InGaAs/InP epitaxial layer structure that was optimized for high carrier transit time-limited bandwidth. Photodiode integration was achieved using a scalable wafer die bonding approach that is fully compatible with the LNOI platform. %B Photonics Research %V 10 %P 1338-1343 %G eng %U https://opg.optica.org/prj/fulltext.cfm?uri=prj-10-6-1338&id=472896 %N 6 %0 Journal Article %J Nature Communications %D 2022 %T Diamond mirrors for high-power continous-wave lasers %A H. Atikian %A N. Sinclair %A Latawiec, P. %A X. Xiong %A S. Meesala %A S. Gauthier %A D. Wintz %A J. Randi %A D. Bernot %A S. DeFrances %A J. Thomas %A M. Roman %A S. Durrant %A F. Capasso %A Loncar, M. %B Nature Communications %V 13 %P 2610 %G eng %U https://www.nature.com/articles/s41467-022-30335-2 %0 Journal Article %J Optics Express %D 2022 %T Development of new hard masks for reactive ion beam angled etching of diamond %A Cleaven Chia %A Bartholomeus Machielse %A Amirhassan Shams-Ansari %A Loncar, Marko %B Optics Express %V 30 %P 14189 %G eng %U https://opg.optica.org/oe/fulltext.cfm?uri=oe-30-9-14189&id=471343 %0 Journal Article %J Communications Physics %D 2022 %T An integrated lithium-niobate electro-optic platform for spectrally tailored dual-comb spectroscopy %A Amirhassan Shams-Ansari %A Mengjie Yu %A Zaijun Chen %A Christian Reimer %A Zhang, Mian %A Nathalie Picqué %A Lončar, Marko %X A high-resolution broad-spectral-bandwidth spectrometer on a chip would create new opportunities for gas-phase molecular fingerprinting, especially in environmental sensing. A resolution high enough to observe transitions at atmospheric pressure and the simultaneous sensitive detection of multiple atoms or molecules are the key challenges. Here, an electro-optic microring-based dualcomb interferometer, fabricated on a low-loss lithium-niobate-on-insulator nanophotonic platform, demonstrates significant progress towards such an achievement. Spectra spanning 1.6 THz (53 cm-1) at a resolution of 10 GHz (0.33 cm-1) are obtained in a single measurement without requiring frequency scanning or moving parts. The frequency agility of the system enables spectrally-tailored multiplexed sensing, which allows for interrogation of non-adjacent spectral regions, here separated by 6.6 THz (220 cm-1), without compromising the signal-to-noise ratio. %B Communications Physics %V 5 %P 88 %G eng %U https://www.nature.com/articles/s42005-022-00865-8 %0 Journal Article %J Optica %D 2022 %T Electrically pumped high power laser transmitter integrated on thin-film lithium niobate %A Amirhassan Shams-Ansari %A Dylan Renaud %A Rebecca Cheng %A Shao, Linbo %A Lingyan He %A Di Zhu %A Mengjie Yu %A Hannah R. Grant %A Leif Johansson %A Zhang, Mian %A Loncar, Marko %X Integrated thin-film lithium niobate (TFLN) photonics has emerged as a promising platform for realization of high-performance chip-scale optical systems. Of particular importance are TFLN electro-optic modulators featuring high-linearity, low driving voltage and low-propagation loss. However, fully integrated system requires integration of high power, low noise, and narrow linewidth lasers on TFLN chip. Here we achieve this goal, and demonstrate integrated high-power lasers on TFLN platform with up to 60 mW of optical power in the waveguides. We use this platform to realize a high-power transmitter consisting an electrically-pumped laser integrated with a 50 GHz modulator. %B Optica %V 9 %P 408 %G eng %U https://opg.optica.org/optica/fulltext.cfm?uri=optica-9-4-408&id=471161 %0 Journal Article %J Nature Communications %D 2022 %T Integrated silicon carbide electro-optic modulator %A Keith Powell %A Liwei Li %A Amirhassan Shams-Ansari %A Jianfu Wang %A Debin Meng %A Neil Sinclair %A Jiangdong Deng %A Lončar, Marko %A Xiaoke Yi %B Nature Communications %V 13 %P 1851 %G eng %U https://www.nature.com/articles/s41467-022-29448-5 %0 Journal Article %J Physical Review X %D 2022 %T Mechanical control of a single nuclear spin %A Smarak Maity* %A Benjamin Pingault* %A Graham Joe %A Michelle Chalupnik %A Daniel Assumpção %A Eliza Cornell %A Shao, Linbo %A Lončar, Marko %B Physical Review X %V 12 %P 011056 %8 Mar 2022 %G eng %U https://journals.aps.org/prx/abstract/10.1103/PhysRevX.12.011056 %N 1 %0 Journal Article %J Physical Review Applied %D 2022 %T Sample-efficient adaptive calibration of quantum networks using Bayesian optimization %A Cortes, Cristian %A Lefebvre, Pascal %A Nikolai Lauk %A David, Michael %A Neil Sinclair %A Gray, Stephen %A Daniel Oblak %B Physical Review Applied %V 17 %P 034067 %8 28 Mar, 2022 %G eng %U https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.17.034067 %0 Journal Article %J Optica %D 2022 %T Quasi-static optical parametric amplification %A Marc Jankowski %A Nayara Jornod %A Carsten Langrock %A Boris Desiatov %A Alireza Marandi %A Lončar, Marko %A Martin M. Fejer %B Optica %V 9 %P 273 %G eng %U https://opg.optica.org/optica/fulltext.cfm?uri=optica-9-3-273&id=469929 %0 Journal Article %J Journal of Physics: Photonics %D 2022 %T Diamond Integrated Quantum Photonics (section 13 in Roadmap on Integrated Quantum Photonics) %A Benjamin Pingault %A Bartholomeus Machielse %A Loncar, Marko %B Journal of Physics: Photonics %V 4 %P 012501 %G eng %U https://iopscience.iop.org/article/10.1088/2515-7647/ac1ef4 %N 1 %0 Journal Article %J Journal of Physics: Photonics %D 2022 %T Quantum Photonics with Thin-Film Lithium Niobate Roadmap on Integrated (section 7 in Roadmap on Integrated Quantum Photonics) %A Neil Sinclair %A Loncar, Marko %B Journal of Physics: Photonics %V 4 %P 012501 %G eng %U https://doi.org/10.1088/2515-7647/ac1ef4 %N 1 %0 Journal Article %J Applied Physics Letters %D 2022 %T Extended many-body superradiance in diamond epsilon near-zero metamaterials %A Olivia Mello %A Li, Yang %A Sarah Alejandra Camayd-Muñoz %A Clayton DeVault %A Michaël Lobet %A Haoning Tang %A Marko Lonçar %A Mazur, Eric %B Applied Physics Letters %V 120 %P 061105 %G eng %U https://aip.scitation.org/doi/full/10.1063/5.0062869?journalCode=apl %0 Journal Article %J Nature Communications %D 2022 %T Probing dark exciton navigation through a local strain landscape in a WSe2 monolayer %A R. J. Gelly %A D. Renaud %A X. Liao %A B. Pingault %A S. Bogdanovic %A G. Scuri %A Watanabe, K. %A Taniguchi, T. %A B. Urbaszek %A H. Park %A Loncar, M. %B Nature Communications %V 13 %P 232 %G eng %U https://www.nature.com/articles/s41467-021-27877-2 %0 Journal Article %J Nature %D 2021 %T On-chip electro-optic frequency shifters and beam splitters %A Yaowen Hu %A Mengjie Yu %A Di Zhu %A Neil Sinclair %A Amirhassan Shams-Ansari %A Shao, Linbo %A Holzgrafe, Jeffrey %A Puma, Eric %A Zhang, Mian %A Loncar, Marko %B Nature %V 599 %P 587 %G eng %U https://www.nature.com/articles/s41586-021-03999-x %0 Journal Article %J Physical Review Letters %D 2021 %T Long-Lived Solid-State Optical Memory for High-Rate Quantum Repeaters %A Askarani, Mohsen Falamarzi %A Das, Antariksha %A Davidson, Jacob %A Amaral, Gustavo %A Neil Sinclair %A Slater, Joshua %A Marzban, Sara %A Thiel, Charles %A Cone, Rufus %A Daniel Oblak %A Wolfgang Tittel %B Physical Review Letters %V 127 %G eng %U https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.220502 %N 220502 %0 Journal Article %J Applied Physics Letters %D 2021 %T Telecommunication-wavelength two-dimensional photonic crystal cavities in a thin single-crystal diamond membrane %A Kazuhiro Kuruma %A Afaq Habib Piracha %A Dylan Renaud %A Cleaven Chia %A Neil Sinclair %A Athavan Nadarajah %A Stacey, Alastair %A Steven Prawer %A Loncar, Marko %B Applied Physics Letters %V 119 %P 171106 %G eng %U https://aip.scitation.org/doi/10.1063/5.0061778 %N 17 %0 Journal Article %J Physical Review Letters %D 2021 %T Optically-Heralded Entanglement of Superconducting Systems in Quantum Networks %A Stefan Krastanov %A Hamza Raniwala %A Holzgrafe, Jeffrey %A Kurt Jacobs %A Loncar, Marko %A Matthew J. Reagor %A Dirk R. Englund %B Physical Review Letters %V 127 %P 040503 %G eng %U https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.040503 %0 Journal Article %J Applied Physics Letters %D 2021 %T Coupling of a Single Tin-vacancy Center to a Photonic Crystal Cavity in Diamond %A Kazuhiro Kuruma %A Benjamin Pingault %A Cleaven Chia %A Dylan Renaud %A Hoffmann, Patrick %A Satoshi Iwamoto %A Ronning, Carsten %A Lončar, Marko %B Applied Physics Letters %V 118 %P 230601 %G eng %U https://aip.scitation.org/doi/10.1063/5.0051675 %N 23 %0 Journal Article %J communications physics %D 2021 %T Confinement of long-lived interlayer excitons in WS2/WSe2 heterostructures %A Alejandro R.-P. Montblanch %A Dhiren M. Kara %A Ioannis Paradisanos %A Carola M. Purser %A Matthew S. G. Feuer %A Evgeny M. Alexeev %A Lucio Stefan %A Ying Qin %A Mark Blei %A Wang, Gang %A Alisson R. Cadore %A Latawiec, Pawel %A Lončar, Marko %A Tongay, Sefaattin %A Andrea C. Ferrari %A Mete Atatüre %B communications physics %V 4 %P 119 %G eng %U https://www.nature.com/articles/s42005-021-00625-0 %0 Journal Article %J Advances in Optics and Photonics %D 2021 %T Integrated photonics on thin-film lithium niobate %A Di Zhu %A Shao, Linbo %A Mengjie Yu %A Rebecca Cheng %A Boris Desiatov %A C. J. Xin %A Yaowen Hu %A Holzgrafe, Jeffrey %A Ghosh, Soumya %A Amirhassan Shams-Ansari %A Puma, Eric %A Neil Sinclair %A Christian Reimer %A Zhang, Mian %A Lončar, Marko %X Lithium niobate (LN), an outstanding and versatile material, has influenced our daily life for decades: from enabling high-speed optical communications that form the backbone of the Internet to realizing radio-frequency filtering used in our cell phones. This half-century-old material is currently embracing a revolution in thin-film LN integrated photonics. The successes of manufacturing wafer-scale, high-quality, thin films of LN on insulator (LNOI) and breakthroughs in nanofabrication techniques have made high-performance integrated nanophotonic components possible. With rapid development in the past few years, some of these thin-film LN devices, such as optical modulators and nonlinear wavelength converters, have already outperformed their legacy counterparts realized in bulk LN crystals. Furthermore, the nanophotonic integration enabled ultra-low-loss resonators in LN, which unlocked many novel applications such as optical frequency combs and quantum transducers. In this Review, we cover -- from basic principles to the state of the art -- the diverse aspects of integrated thin-film LN photonics, including the materials, basic passive components, and various active devices based on electro-optics, all-optical nonlinearities, and acousto-optics. We also identify challenges that this platform is currently facing and point out future opportunities. The field of integrated LNOI photonics is advancing rapidly and poised to make critical impacts on a broad range of applications in communication, signal processing, and quantum information. %B Advances in Optics and Photonics %V 13 %P 242-352 %G eng %U https://doi.org/10.1364/AOP.411024 %N 2 %0 Journal Article %J Optica %D 2021 %T Integrated lithium niobate electro-optic modulators: when performance meets scalability %A Zhang, Mian %A Wang, Cheng %A Prashanta Kharel %A Di Zhu %A Loncar, Marko %X Electro-optic modulators (EOMs) convert signals from the electrical to the optical domain. They are at the heart of optical communication, microwave signal processing, sensing, and quantum technologies. Next-generation EOMs require high-density integration, low cost, and high performance simultaneously, which are difficult to achieve with established integrated photonics platforms. Thin-film lithium niobate (LN) has recently emerged as a strong contender owing to its high intrinsic electro-optic (EO) efficiency, industry-proven performance, robustness, and, importantly, the rapid development of scalable fabrication techniques. The thin-film LN platform inherits nearly all the material advantages from the legacy bulk LN devices and amplifies them with a smaller footprint, wider bandwidths, and lower power consumption. Since the first adoption of commercial thin-film LN wafers only a few years ago, the overall performance of thin-film LN modulators is already comparable with, if not exceeding, the performance of the best alternatives based on mature platforms such as silicon and indium phosphide, which have benefited from many decades of research and development. In this mini-review, we explain the principles and technical advances that have enabled state-of-the-art LN modulator demonstrations. We discuss several approaches, their advantages and challenges. We also outline the paths to follow if LN modulators are to improve further, and we provide a perspective on what we believe their performance could become in the future. Finally, as the integrated LN modulator is a key subcomponent of more complex photonic functionalities, we look forward to exciting opportunities for larger-scale LN EO circuits beyond single components. %B Optica %V 8 %P 652-667 %G eng %U https://doi.org/10.1364/OPTICA.415762 %N 5 %0 Journal Article %J Physical Review B %D 2021 %T Optical coherence and energy-level properties of a Tm3+-doped LiNbO3 waveguide at subkelvin temperatures %A Neil Sinclair %A Daniel Oblak %A Erhan Saglamyurek %A Rufus L. Cone %A Charles W. Thiel %A Wolfgang Tittel %B Physical Review B %V 103 %P 134105 %G eng %U https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.134105 %0 Journal Article %J PRX Quantum %D 2021 %T Development of Quantum InterConnects (QuICs) for Next-Generation Information Technologies %A David Awschalom %A Karl K. Berggren %A Hannes Bernien %A Sunil Bhave %A Lincoln D. Carr %A Paul Davids %A Sophia E. Economou %A Dirk Englund %A Faraon, Andrei %A Marty Fejer %A Saikat Guha %A Martin V. Gustafsson %A Hu, Evelyn %A Jiang, Liang %A Jungsang Kim %A Boris Korzh %A Prem Kumar %A Paul G. Kwiat %A Lončar, Marko %A Mikhail D. Lukin %A David A. B. Miller %A Christopher Monroe %A Sae Woo Nam %A Narang, Prineha %A Jason S. Orcutt %A Michael G. Raymer %A Amir H. Safavi-Naeini %A Maria Spiropulu %A Srinivasan, Kartik %A Shuo Sun %A Vučković, Jelena %A Edo Waks %A Walsworth, Ronald %A Andrew M. Weiner %A Zheshen Zhang %X Just as “classical” information technology rests on a foundation built of interconnected information-processing systems, quantum information technology (QIT) must do the same. A critical component of such systems is the “interconnect,” a device or process that allows transfer of information between disparate physical media, for example, semiconductor electronics, individual atoms, light pulses in optical fiber, or microwave fields. While interconnects have been well engineered for decades in the realm of classical information technology, quantum interconnects (QuICs) present special challenges, as they must allow the transfer of fragile quantum states between different physical parts or degrees of freedom of the system. The diversity of QIT platforms (superconducting, atomic, solid-state color center, optical, etc.) that will form a “quantum internet” poses additional challenges. As quantum systems scale to larger size, the quantum interconnect bottleneck is imminent, and is emerging as a grand challenge for QIT. For these reasons, it is the position of the community represented by participants of the NSF workshop on “Quantum Interconnects” that accelerating QuIC research is crucial for sustained development of a national quantum science and technology program. Given the diversity of QIT platforms, materials used, applications, and infrastructure required, a convergent research program including partnership between academia, industry, and national laboratories is required. %B PRX Quantum %V 2 %P 017002 %G eng %U https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.2.017002 %0 Book Section %B Semiconductors and Semimetals: Diamond for Quantum Applications Part 2 %D 2021 %T Diamond quantum nanophotonics and optomechanics %A Cleaven Chia %A Bartholomeus Machielse %A Benjamin Pingault %A Michelle Chalupnik %A Graham Joe %A Eliza Cornell %A Sophie Weiyi Ding %A Stefan Bogdanovic %A Kazuhiro Kuruma %A Afaq Habib Piracha %A Smarak Maity %A Thomas M. Babinec %A Meesala, Srujan %A Lončar, Marko %B Semiconductors and Semimetals: Diamond for Quantum Applications Part 2 %I Academic Press, Elsevier %V 104 %G eng %U https://www.elsevier.com/books/diamond-for-quantum-applications-part-2/nebel/978-0-323-85024-7 %0 Journal Article %J Optica %D 2020 %T Cavity electro-optics in thin-film lithium niobate for efficient microwave-to-optical transduction %A Holzgrafe, Jeffrey %A Neil Sinclair %A Di Zhu %A Amirhassan Shams-Ansari %A Marco Colangelo %A Yaowen Hu %A Zhang, Mian %A Karl K. Berggren %A Lončar, Marko %B Optica %V 7 %P 1714 %G eng %U https://www.osapublishing.org/optica/fulltext.cfm?uri=optica-7-12-1714&id=444323 %0 Journal Article %J PRX Quantum %D 2020 %T Teleportation Systems Towards a Quantum Internet %A Raju Valivarthi %A Samantha I. Davis %A Cristián Peña %A Si Xie %A Nikolai Lauk %A Lautaro Narváez %A Jason P. Allmaras %A Andrew D. Beyer %A Yewon Gim %A Meraj Hussein %A George Iskander %A Hyunseong Linus Kim %A Boris Korzh %A Andrew Mueller %A Mandy Rominsky %A Matthew Shaw %A Dawn Tang %A Emma E. Wollman %A Christoph Simon %A Panagiotis Spentzouris %A Daniel Oblak %A Neil Sinclair %A Maria Spiropulu %B PRX Quantum %V 1 %G eng %U https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.1.020317 %N 020317 %0 Book Section %B Ultra-high-Q Optical Microcavities %D 2020 %T Chapter 1: High-Q Lithium Niobate Microcavities and Their Applications %A Wang, Cheng %A Zhang, Mian %A Loncar, Marko %X Lithium niobate (LN) is an excellent nonlinear optical and electro-optic material that has found many applications in classical nonlinear optics, optical fiber communications and quantum photonics. Here we review the recent development of thin-film LN technology that has allowed the miniaturization of LN photonic devices and microcavities with ultra-high quality factors. We discuss the design principle of LN devices that makes use of the largest nonlinear coefficients, various device fabrication approaches and resulting device performances, and the current and potential applications of LN microcavities. %B Ultra-high-Q Optical Microcavities %I World Scientific %P 1-35 %G eng %U https://www.worldscientific.com/doi/abs/10.1142/9789814566070_0001 %0 Journal Article %J Engineering Research Express %D 2020 %T Discrepancies in the free spectral range (FSR) of one-dimensional (1D) photonic crystal/photonic wire coupled-cavities %A Mohd Nuriman Nawi %A Dilla Duryha Berhanuddin %A Loncar, Marko %A Mohd Adzir Mahdi %A Richard M De La Rue %A Ahmad Rifqi Md Zain %B Engineering Research Express %V 2 %P 045008 %G eng %U https://iopscience.iop.org/article/10.1088/2631-8695/abbd79/meta %N 4 %0 Journal Article %J Nanophotonics %D 2020 %T A metasurface-based diamond frequency converter using plasmonic nanogap resonators %A Qixin Shen %A Amirhassan Shams-Ansari %A Andrew M. Boyce %A Nathaniel C. Wilson %A Cai, Tao %A Loncar, Marko %A Maiken H. Mikkelsen %B Nanophotonics %G eng %U https://www.degruyter.com/view/journals/nanoph/ahead-of-print/article-10.1515-nanoph-2020-0392/article-10.1515-nanoph-2020-0392.xml %0 Journal Article %J IEEE Microwave Magazine %D 2020 %T Imaging Acoustic Waves by Microwave Microscopy: Microwave Impedance Microscopy for Visualizing Gigahertz Acoustic Waves %A Zheng, Lu %A Shao, Linbo %A Loncar, Marko %A Lai, Keji %B IEEE Microwave Magazine %V 21 %P 60 %G eng %0 Journal Article %J Optica %D 2020 %T Realization of high-dimensional frequency crystals in electro-optic microcombs %A Yaowen Hu %A Christian Reimer %A Amirhassan Shams-Ansari %A Zhang, Mian %A Loncar, Marko %B Optica %V 7 %P 1189-1194 %G eng %U https://www.osapublishing.org/optica/abstract.cfm?uri=optica-7-9-1189 %0 Journal Article %J Optics Express %D 2020 %T Wafer-scale low-loss lithium niobate photonic integrated circuits %A Kevin Luke %A Prashanta Kharel %A Christian Reimer %A Lingyan He %A Loncar, Marko %A Zhang, Mian %X

Thin-film lithium niobate (LN) photonic integrated circuits (PICs) could enable ultrahigh performance in electro-optic and nonlinear optical devices. To date, realizations have been limited to chip-scale proof-of-concepts. Here we demonstrate monolithic LN PICs fabricated on 4- and 6-inch wafers with deep ultraviolet lithography and show smooth and uniform etching, achieving 0.27 dB/cm optical propagation loss on wafer-scale. Our results show that LN PICs are fundamentally scalable and can be highly cost-effective.

%B Optics Express %V 28 %P 24452 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-28-17-24452 %0 Journal Article %J Physical Review Applied %D 2020 %T Magnetic Field Fingerprinting of Integrated-Circuit Activity with a Quantum Diamond Microscope %A Matthew J. Turner %A Nicholas Langellier %A Rachel Bainbridge %A Dan Walters %A Meesala, Srujan %A Thomas M. Babinec %A Pauli Kehayias %A Yacoby, Amir %A Hu, Evelyn %A Lončar, Marko %A Walsworth, Ronald L. %A Edlyn V. Levine %B Physical Review Applied %V 14 %G eng %U https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.14.014097 %N 014097 %0 Journal Article %J AIP Advances %D 2020 %T Chalcogen-hyperdoped germanium for short-wavelength infrared photodetection %A Hemi H. Gandhi %A David Pastor %A Tran, Tuan T. %A Kalchmair, Stefan %A Lachlan A. Smillie %A Jonathan P. Mailoa %A Ruggero Milazzo %A Enrico Napolitani %A Loncar, Marko %A Williams, James S. %A Michael J. Aziz %A Mazur, Eric %B AIP Advances %V 10 %P 075028 %G eng %U https://aip.scitation.org/doi/full/10.1063/5.0008281 %0 Patent %D 2020 %T System and method for wafer-scale fabrication of free standing mechanical and photonic structures by ion beam etching %A Haig Avedis Atikian %A Loncar, Marko %7 United States of America %V 10727072 %G eng %U https://patents.google.com/patent/US10727072B2/en %& US %0 Journal Article %J Optics Express %D 2020 %T Integrated microwave acousto-optic frequency shifter on thin-film lithium niobate %A Shao, Linbo %A Neil Sinclair %A James Leatham %A Yaowen Hu %A Mengjie Yu %A Terry Turpin %A Devon Crowe %A Loncar, Marko %B Optics Express %V 28 %P 23728 %G eng %U https://doi.org/10.1364/OE.397138 %N 16 %0 Journal Article %J Optica %D 2020 %T Chip-based self-referencing using integrated lithium niobate waveguides %A Yoshitomo Okawachi %A Mengjie Yu %A Boris Desiatov %A Bok Young Kim %A Tobias Hansson %A Lončar, Marko %A Alexander L. Gaeta %B Optica %V 7 %P 702-707 %G eng %U https://www.osapublishing.org/optica/abstract.cfm?uri=optica-7-6-702 %N 6 %0 Journal Article %J Physical Review Letters %D 2020 %T Electrically tunable valley dynamics in twisted WSe2/WSe2 bilayers %A Giovanni Scuri %A Trond I. Andersen %A Zhou, You %A Dominik S. Wild %A Jiho Sung %A Ryan J. Gelly %A Damien Bérubé %A Hoseok Heo %A Shao, Linbo %A Andrew Y. Joe %A Andrés M. Mier Valdivia %A Takashi Taniguchi %A Kenji Watanabe %A Lončar, Marko %A Philip Kim %A Mikhail D. Lukin %A Park, Hongkun %B Physical Review Letters %V 124 %P 217403 %G eng %U https://journals-aps-org.ezp-prod1.hul.harvard.edu/prl/abstract/10.1103/PhysRevLett.124.217403 %0 Journal Article %J Nature Electronics %D 2020 %T Nonreciprocal transmission of microwave acoustic waves in nonlinear parity-time-symmetric resonators %A Shao, Linbo %A Wenbo Mao %A Smarak Maity %A Neil Sinclair %A Yaowen Hu %A Yang, Lan %A Loncar, Marko %B Nature Electronics %V 3 %P 267-272 %G eng %U https://www.nature.com/articles/s41928-020-0414-z %0 Journal Article %J Nature %D 2020 %T Experimental demonstration of memory-enhanced quantum communication %A M.Bhaskar %A R. Riedinger %A B. Machielse %A D. Levonian %A C. Nguyen %A E. Knall %A H. Park %A D. Englund %A Loncar, M. %A D. Sukachev %A M. Lukin %B Nature %V 580 %P 60–64 %G eng %U https://www.nature.com/articles/s41586-020-2103-5 %0 Journal Article %J Quantum Science and Technology %D 2020 %T Perspectives on quantum transduction %A Nikolai Lauk %A Neil Sinclair %A Shabir Barzanjeh %A Jacob P. Covey %A Mark Saffman %A Maria Spiropulu %A Christoph Simon %B Quantum Science and Technology %V 5 %P 020501 %8 10 Oct, 2019 %G eng %U https://iopscience.iop.org/article/10.1088/2058-9565/ab788a/meta %0 Journal Article %J Journal of Lightwave Technology %D 2020 %T Design of Efficient Resonator-Enhanced Electro-Optic Frequency Comb Generators %A Brandon Buscaino %A Zhang, Mian %A Lončar, Marko %A Joseph M. Kahn %X Resonator-enhanced electro-optic (RE-EO) frequency comb generators produce broad combs by coupling an optical field to a resonator containing a phase modulator driven at a harmonic of the resonator free spectral range (FSR). Recent advances in integration technologies have opened up the possibility of fabricating low-loss, efficient, and tunable ring-based RE-EO comb generators. In this work, we analyze the properties of a canonical ring-based RE-EO comb generator and propose a new dual-ring comb generator to increase comb conversion efficiency, an especially important characteristic for comb-based optical communications systems. After a brief review of RE-EO comb generator properties in the case of resonant operation, i.e., when the optical frequency and the modulation frequency are harmonics of the resonator FSR, we analyze the effect of input optical phase noise and modulation phase noise on the resulting comb. Additionally, we show analytically that in non-resonant operation the optical frequency offset and the modulation frequency offset can be much larger than the linewidth of the resonator, increasing the tolerance to fabrication errors. Then, we develop and validate numerical models to predict the output spectrum in the presence of dispersive waveguides, which cannot be modeled analytically. Using these accurate models, we analyze a dual-ring RE-EO comb generator that uses a small coupling ring to increase the conversion efficiency to 32%, compared to the 1.3% efficiency of a single-ring RE-EO comb generator. We then analyze a point-to-point inter-data center optical link and determine that a dual-ring RE-EO comb generator can support high-capacity coherent links at 20 Tb/s per fiber. %B Journal of Lightwave Technology %V 38 %P 1400-1413 %G eng %U https://www.osapublishing.org/jlt/abstract.cfm?uri=jlt-38-6-1400 %N 6 %0 Journal Article %J Optics Express %D 2020 %T High-Q suspended optical resonators in 3C silicon carbide obtained by thermal annealing %A Keith Powell %A Amirhassan Shams-Ansari %A Smit Desai %A Mitchell Austin %A Jiangdong Deng %A Neil Sinclair %A Lončar, Marko %A Xiaoke Yi %X We fabricate suspended single-mode optical waveguides and ring resonators in 3C silicon carbide (SiC) that operate at telecommunication wavelength, and leverage post-fabrication thermal annealing to minimize optical propagation losses. Annealed optical resonators yield quality factors of over 41,000, which corresponds to a propagation loss of 7 dB/cm, and is a significant improvement over the 24 dB/cm in the case of the non-annealed chip. This improvement is attributed to the enhancement of SiC crystallinity and a significant reduction of waveguide surface roughness, from 2.4 nm to below 1.7 nm. The latter is attributed to surface layer oxide growth during the annealing step. We confirm that the thermo-optic coefficient, an important parameter governing high-power and temperature-dependent performance of SiC, does not vary with annealing and is comparable to that of bulk SiC. Our annealing-based approach, which is especially suitable for suspended structures, offers a straightforward way to realize high-performance 3C-SiC integrated circuits. %B Optics Express %V 28 %P 4938-4949 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-28-4-4938 %N 4 %0 Journal Article %J Light: Science & Applications %D 2020 %T Raman lasing and soliton mode-locking in lithium-niobate microresonators %A Mengjie Yu %A Yoshitomo Okawachi %A Rebecca Cheng %A Wang, Cheng %A Zhang, Mian %A Alexander L. Gaeta %A Loncar, Marko %B Light: Science & Applications %V 9 %G eng %U https://www.nature.com/articles/s41377-020-0246-7 %N 9 %0 Journal Article %J Nature Communications %D 2020 %T Coherent Acoustic Control of a Single Silicon Vacancy Spin in Diamond %A Smarak Maity %A Shao, Linbo %A Stefan Bogdanović %A Meesala, Srujan %A Sohn, Young-Ik %A Neil Sinclair %A Benjamin Pingault %A Michelle Chalupnik %A Cleaven Chia %A Zheng, Lu %A Lai, Keji %A Lončar, Marko %B Nature Communications %V 11 %P 193 %8 10 Jan, 2020 %G eng %U https://www.nature.com/articles/s41467-019-13822-x %N 1 %0 Journal Article %J Optica %D 2020 %T Ultrabroadband Nonlinear Optics in Nanophotonic Periodically Poled Lithium Niobate Waveguides %A Marc Jankowski %A C. Langrock %A Boris Desiatov %A Alireza Marandi %A Wang, Cheng %A Zhang, Mian %A Christopher R. Phillips %A Marko Lonvcar %A M. M. Fejer %X Quasi-phasematched interactions in waveguides with quadratic nonlinearities enable highly efficient nonlinear frequency conversion. In this article, we demonstrate the first generation of devices that combine the dispersion-engineering available in nanophotonic waveguides with quasi-phasematched nonlinear interactions available in periodically poled lithium niobate (PPLN). This combination enables quasi-static interactions of femtosecond pulses, reducing the pulse energy requirements by several orders of magnitude, from picojoules to femtojoules. We experimentally demonstrate two effects associated with second harmonic generation. First, we observe efficient quasi-phasematched second harmonic generation with <100 fJ of pulse energy. Second, in the limit of strong phase-mismatch, we observe spectral broadening of both harmonics with as little as 2-pJ of pulse energy. These results lay a foundation for a new class of nonlinear devices, in which co-engineering of dispersion with quasi-phasematching enables efficient nonlinear optics at the femtojoule level. %B Optica %V 7 %P 40-46 %8 10/01/2019 %G eng %U https://www.osapublishing.org/optica/fulltext.cfm?uri=optica-7-1-40 %N 1 %0 Journal Article %J Optica %D 2019 %T Microwave-to-optical conversion using lithium niobate thin-film acoustic resonators %A Shao, Linbo %A Mengjie Yu %A Smarak Maity %A Neil Sinclair %A Zheng, Lu %A Cleaven Chia %A Amithassan Shams-Ansari %A Wang, Cheng %A Zhang, Mian %A Lai, Keji %A Loncar, Marko %B Optica %V 6 %P 1498-1505 %8 20 Dec 2019 %G eng %U https://doi.org/10.1364/OPTICA.6.001498 %N 12 %0 Journal Article %J IEEE Photonics Technology Letters %D 2019 %T Chip-Based Lithium Niobate Frequency Combs %A Mengjie Yu %A Wang, Cheng %A Zhang, Mian %A Loncar, Marko %B IEEE Photonics Technology Letters %V 31 %P 1894-1897 %8 30 Oct 2019 %G eng %U https://ieeexplore.ieee.org/abstract/document/8887492 %N 23 %0 Journal Article %J Physical Review B %D 2019 %T An integrated nanophotonic quantum register based on silicon-vacancy spins in diamond %A C.T. Nguyen %A D. D. Sukachev %A M. K. Bhaskar %A B. Machielse %A D. S. Levonian %A E. N. Knall %A P. Stroganov %A C. Chia %A Burek, M. J. %A R. Riedinger %A H. Park %A Loncar, M. %A M. D. Lukin %B Physical Review B %V 100 %P 165428 %G eng %U https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.165428 %0 Journal Article %J Physical Review Letters %D 2019 %T Quantum network nodes based on diamond qubits with an efficient nanophotonic interface %A C.T. Nguyen %A D. D. Sukachev %A M. K. Bhaskar %A B. Machielse %A D. S. Levonian %A E. N. Knall %A P. Stroganov %A R. Riedinger %A H. Park %A Loncar, M. %A M. D. Lukin %B Physical Review Letters %V 123 %P 183602 %G eng %U https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.183602 %0 Journal Article %J Applied Physics Letters %D 2019 %T Silicon photodetector for integrated lithium niobate photonics %A Boris Desiatov %A Lončar, Marko %X We demonstrate the integration of an amorphous silicon photodetector with a thin film lithium niobate photonic platform operating in the visible wavelength range. We present the details of the design, fabrication, integration, and experimental characterization of this metal-semiconductor-metal photodetector that features a responsivity of 22 mA/W to 37 mA/W over the wide optical bandwidth spanning in the 635 nm–850 nm wavelength range. %B Applied Physics Letters %V 115 %G eng %U https://aip.scitation.org/doi/10.1063/1.5118901 %N 2 %0 Generic %D 2019 %T Supercontinuum generation in angle-etched diamond waveguides %A Amirhassan Shams-Ansari %A Latawiec, Pawel %A Yoshitomo Okawachi %A Venkataraman, Vivek %A Mengjie Yu %A Boris Desiatov %A Atikian, Haig %A Gary L. Harris %A Nathalie Picque %A Alexander L. Gaeta %A Loncar, Marko %V 44 %P 4056-4059 %G eng %U https://www.osapublishing.org/ol/abstract.cfm?uri=ol-44-16-4056 %N 16 %0 Journal Article %J Physical Review X %D 2019 %T Electromechanical Control of Quantum Emitters in Nanophotonic Devices %A B Machielse %A S Bogdanovic %A Meesala, S %A Gauthier, S %A Burek, MJ %A G Joe %A M Chalupnik %A YI Sohn %A J Holzgrafe %A R E Evans %A C Chia %A Atikian, H %A M K Bhaskar %A D D Sukachev %A L Shao %A S Maity %A Lukin, M D %A Loncar, M. %B Physical Review X %V 9 %P 031022 %G eng %U https://journals.aps.org/prx/abstract/10.1103/PhysRevX.9.031022 %0 Journal Article %J Physical Review Applied %D 2019 %T Phononic Band Structure Engineering for High-Q Gigahertz Surface Acoustic Wave Resonators on Lithium Niobate %A Shao, Linbo %A Smarak Maity %A Zheng, Lu %A Lue Wu %A Amirhassan Shams-Ansari %A Sohn, Young-Ik %A Puma, Eric %A Gadalla, M.N. %A Zhang, Mian %A Wang, Cheng %A Hu, Evelyn %A Lai, Keji %A Lončar, Marko %B Physical Review Applied %V 12 %P 014022 %8 25 Jan, 2019 %G eng %U https://doi.org/10.1103/PhysRevApplied.12.014022 %0 Journal Article %J Optical Materials Express %D 2019 %T Laser spectroscopic characterization of negatively charged nitrogen-vacancy (NV−) centers in diamond %A Shova D Subedi %A Vladimir V Fedorov %A Jeremy Peppers %A Dmitry V Martyshkin %A Sergey B Mirov %A Shao, Linbo %A Loncar, Marko %B Optical Materials Express %V 9 %P 2076 %G eng %U https://doi.org/10.1364/OME.9.002076 %N 5 %0 Journal Article %J Optica %D 2019 %T Ultra-low loss integrated visible photonics using thin-film lithium niobate %A Boris Desiatov %A Amirhassan Shams-Ansari %A Zhang, Mian %A Wang, Cheng %A Loncar, Marko %X Integrated photonics is a powerful platform that can improve the performance and stability of optical systems, while providing low-cost, small-footprint and scalable alternatives to implementations based on free-space optics. While great progress has been made on the development of low-loss integrated photonics platforms at telecom wavelengths, visible wavelength range has received less attention. Yet, many applications utilize visible or near-visible light, including those in optical imaging, optogenetics, and quantum science and technology. Here we demonstrate an ultra-low loss integrated visible photonics platform based on thin film lithium niobate on insulator. Our waveguides feature ultra-low propagation loss of 6 dB/m, while our microring resonators have an intrinsic quality factor of 11 million, both measured at 637 nm wavelength. Additionally, we demonstrate an on-chip visible intensity modulator with an electro-optic bandwidth of 10 GHz, limited by the detector used. The ultra-low loss devices demonstrated in this work, together with the strong second- and third-order nonlinearities in lithium niobate, open up new opportunities for creating novel passive, and active devices for frequency metrology and quantum information processing in the visible spectrum range. %B Optica %V 6 %P 380-384 %8 24 Feb %G eng %U https://www.osapublishing.org/optica/abstract.cfm?uri=optica-6-3-380 %N 3 %0 Journal Article %J Nature communications %D 2019 %T Monolithic lithium niobate photonic circuits for Kerr frequency comb generation and modulation %A Wang, Cheng %A Zhang, Mian %A Mengjie Yu %A Rongrong Zhu %A Han Hu %A Loncar, Marko %X Microresonator Kerr frequency combs, which rely on third-order nonlinearity (χ(3)), are of great interest for a wide range of applications including optical clocks, pulse shaping, spectroscopy, telecommunications, light detection and ranging (LiDAR) and quantum information processing. Many of these applications require further spectral and temporal control of the generated frequency comb signal, which is typically accomplished using additional photonic elements with strong second-order nonlinearity (χ(2)). To date these functionalities have largely been implemented as discrete off-chip components due to material limitations, which come at the expense of extra system complexity and increased optical losses. Here we demonstrate the generation, filtering and electro-optic modulation of a frequency comb on a single monolithic integrated chip, using a thin-film lithium niobate (LN) photonic platform that simultaneously possesses large χ(2) and χ(3) nonlinearities and low optical losses. We generate broadband Kerr frequency combs using a dispersion-engineered high quality factor LN microresonator, select a single comb line using an electrically programmable add-drop filter, and modulate the intensity of the selected line. Our results pave the way towards monolithic integrated frequency comb solutions for spectroscopy data communication, ranging and quantum photonics. %B Nature communications %V 10 %G eng %U https://www.nature.com/articles/s41467-019-08969-6 %N 978 %0 Journal Article %J Optics Letters %D 2019 %T Coherent two-octave-spanning supercontinuum generation in lithium-niobate waveguides %A Mengjie Yu %A Boris Desiatov %A Yoshitomo Okawachi %A Alexander L. Gaeta %A Lončar, Marko %X We demonstrate coherent supercontinuum generation (SCG) in a monolithically integrated lithium-niobate waveguide, under the presence of second- and third-order nonlinear effects. We achieve more than two octaves of optical bandwidth in a 0.5-cm-long waveguide with 100-picojoule-level pulses. Dispersion engineering of the waveguide allows for spectral overlap between the SCG and the second harmonic which enables direct detection of the carrier-envelope offset frequency f CEO using a single waveguide. We measure the f CEO of our femtosecond pump source with a 30-dB signal-to-noise ratio. %B Optics Letters %V 44 %P 1222-1225 %8 26 Feb, 2019 %G eng %U https://www.osapublishing.org/ol/abstract.cfm?uri=ol-44-5-1222 %N 5 %0 Journal Article %J Nature %D 2019 %T Broadband electro-optic frequency comb generation in an integrated microring resonator %A Zhang, Mian %A Brandon Buscaino %A Wang, Cheng %A Amirhassan Shams-Ansari %A Christian Reimer %A Rongrong Zhu %A Joseph Kahn %A Loncar, Marko %X Optical frequency combs consist of equally spaced discrete optical frequency components and are essential tools for optical communications and for precision metrology, timing and spectroscopy. To date, wide-spanning combs are most often generated by mode-locked lasers or dispersion-engineered resonators with third-order Kerr nonlinearity. An alternative comb generation method uses electro-optic (EO) phase modulation in a resonator with strong second-order nonlinearity, resulting in combs with excellent stability and controllability. Previous EO combs, however, have been limited to narrow widths by a weak EO interaction strength and a lack of dispersion engineering in free-space systems. In this work, we overcome these limitations by realizing an integrated EO comb generator in a thin-film lithium niobate photonic platform that features a large electro-optic response, ultra-low optical loss and highly co-localized microwave and optical felds, while enabling dispersion engineering. Our measured EO frequency comb spans more than the entire telecommunications L-band (over 900 comb lines spaced at ~ 10 GHz), and we show that future dispersion engineering can enable octave-spanning combs. Furthermore, we demonstrate the high tolerance of our comb generator to modulation frequency detuning, with frequency spacing finely controllable over seven orders of magnitude (10 Hz to 100 MHz), and utilize this feature to generate dual frequency combs in a single resonator. Our results show that integrated EO comb generators, capable of generating wide and stable comb spectra, are a powerful complement to integrated Kerr combs, enabling applications ranging from spectroscopy to optical communications. %B Nature %V 568 %P 373 %G eng %U https://arxiv.org/abs/1809.08636 %0 Journal Article %J Nature Photonics %D 2019 %T Electronically Programmable Photonic Molecule %A Zhang, Mian %A Wang, Cheng %A Yaowen Hu %A Amirhassan Shams-Ansari %A Tianhao Ren %A Fan, Shanhui %A Loncar, Marko %X Physical systems with discrete energy levels are ubiquitous in nature and acre fundamental building blocks of quantum technology. Realizing controllable artificial atom- and molecule-like systems for light would enable coherent and dynamic control of the frequency, amplitude and phase of photons1,2,3,4,5. In this work, we demonstrate a ‘photonic molecule’ with two distinct energy levels using coupled lithium niobate microring resonators and control it by external microwave excitation. We show that the frequency and phase of light can be precisely controlled by programmed microwave signals, using concepts of canonical two-level systems including Autler–Townes splitting, Stark shift, Rabi oscillation and Ramsey interference. Through such coherent control, we show on-demand optical storage and retrieval by reconfiguring the photonic molecule into a bright–dark mode pair. These results of dynamic control of light in a programmable and scalable electro-optic system open doors to applications in microwave signal processing6, quantum photonic gates in the frequency domain7and exploring concepts in optical computing8 and topological physics3,9. %B Nature Photonics %V 13 %P 36–40 %G eng %U https://www.nature.com/articles/s41566-018-0317-y %0 Journal Article %J IEEE Photonics Technology Letters %D 2019 %T An integrated low-voltage broadband lithium niobate phase modulator %A Tianhao Ren %A Zhang, Mian %A Wang, Cheng %A Shao, Linbo %A Chrisitian Reimer %A Zhang, Yong %A Oliver King %A Ronald Esman %A Thomas Cullen %A Loncar, Marko %X Electro-optic phase modulators are critical components in modern communication, microwave photonic, and quantum photonic systems. Important for these applications is to achieve modulators with low half-wave voltage at high frequencies. Here we demonstrate an integrated phase modulator, based on a thin-film lithium niobate platform, that simultaneously features small on-chip loss (~ 1 dB) and low half-wave voltage over a large spectral range (3.5 - 4.5 V at 5 - 40 GHz). By driving the modulator with a strong 30-GHz microwave signal corresponding to around four half-wave voltages, we generate an optical frequency comb consisting of over 40 sidebands spanning 10 nm in the telecom L-band. The high electro-optic performance combined with the high RF power-handling ability (3.1 W) of our integrated phase modulator are crucial for future photonics and microwave systems. %B IEEE Photonics Technology Letters %V 31 %P 889 %8 25 Feb, 2019 %G eng %U https://arxiv.org/abs/1902.09070 %0 Journal Article %J Optics Letters %D 2019 %T Low-loss fiber-to-chip interface for lithium niobate photonic integrated circuits %A Lingyan He %A Zhang, Mian %A Amirhassan Shams-Ansari %A Rongrong Zhu %A Wang, Cheng %A Loncar, Marko %X Integrated lithium niobate (LN) photonic circuits have recently emerged as a promising candidate for advanced photonic functions such as high-speed modulation, nonlinear frequency conversion and frequency comb generation. For practical applications, optical interfaces that feature low fiber-to-chip coupling losses are essential. So far, the fiber-to-chip loss (commonly > 10 dB) dominates the total insertion losses of typical LN photonic integrated circuits, where on-chip propagation losses can be as low as 0.03 - 0.1 dB/cm. Here we experimentally demonstrate a low-loss mode size converter for coupling between a standard lensed fiber and sub-micrometer LN rib waveguides. The coupler consists of two inverse tapers that convert the small optical mode of a rib waveguide into a symmetric guided mode of a LN nanowire, featuring a larger mode area matched to that of a tapered optical fiber. The measured fiber-to-chip coupling loss is lower than 1.7 dB/facet with high fabrication tolerance and repeatability. Our results open door for practical integrated LN photonic circuits efficiently interfaced with optical fibers. %B Optics Letters %V 44 %P 2314 %8 25 Feb, 2019 %G eng %U https://arxiv.org/abs/1902.08969 %0 Journal Article %J Optics Express %D 2018 %T Direct thermo-optical tuning of silicon microresonators for the mid-infrared %A L. Koehler %A P. Chevalier %A E. Shim %A B. Desiatov %A A. Shams-Ansari %A M. Piccardo %A Y. Okawachi %A Yu, M. %A Loncar, M. %A M. Lipson %A A. Gaeta %A F. Capasso %X

Weuselightfromavisiblelaserdiodetodirectlytunesilicon-on-chipmicroresonators by thermo-optical effect. We show that this direct tuning is local, non invasive and has a much smaller time constant than global temperature tuning methods. Such an approach could prove to be highly effective for Kerr comb generation in microresonators pumped by quantum cascade lasers, which cannot be easily tuned to achieve comb generation and soliton-modelocked states.

%B Optics Express %V 26 %P 34965 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-26-26-34965 %N 26 %0 Journal Article %J Applied Physics Letters %D 2018 %T Integration of quantum dots with lithium niobate photonics %A Shahriar Aghaeimeibodi %A Boris Desiatov %A Je-Hyung Kim %A Chang-Min Lee %A Mustafa Atabey Buyukkaya %A Aziz Karasahin %A Christopher J. K. Richardson %A Richard P. Leavitt %A Lončar, Marko %A Edo Waks %X The integration of quantum emitters with integrated photonics enables complex quantum photonic circuits that are necessary for photonic implementation of quantum simulators, computers, and networks. Thin-film lithium niobate is an ideal material substrate for quantum photonics because it can tightly confine light in small waveguides and has a strong electro-optic effect that can switch and modulate single photons at low power and high speed. However, lithium niobate lacks efficient single-photon emitters, which are essential for scalable quantum photonic circuits. We demonstrate deterministic coupling of single-photon emitters with a lithium niobate photonic chip. The emitters are composed of InAs quantum dots embedded in an InP nanobeam, which we transfer to a lithium niobate waveguide with nanoscale accuracy using a pick-and-place approach. An adiabatic taper transfers single photons emitted into the nanobeam to the lithium niobate waveguide with high efficiency. We verify the single photon nature of the emission using photon correlation measurements performed with an on-chip beamsplitter. Our results demonstrate an important step toward fast, reconfigurable quantum photonic circuits for quantum information processing. %B Applied Physics Letters %V 113 %P 221102 %G eng %U https://aip-scitation-org.ezp-prod1.hul.harvard.edu/doi/10.1063/1.5054865 %0 Journal Article %J Science %D 2018 %T Photon-mediated interactions between quantum emitters in a diamond nanocavity %A Ruffin E. Evans %A Mihir K. Bhaskar %A Denis D. Sukachev %A Christian T. Nguyen %A Sipahigil, Alp %A Michael J. Burek %A Bartholomeus Machielse %A Grace H. Zhang %A Alexander S. Zibrov %A Edward Bielejec %A Park, Hongkun %A Lončar, Marko %A Mikhail D. Lukin %X Photon-mediated interactions between quantum systems are essential for realizing quantum networks and scalable quantum information processing. We demonstrate such interactions between pairs of silicon-vacancy (SiV) color centers coupled to a diamond nanophotonic cavity. When the optical transitions of the two color centers are tuned into resonance, the coupling to the common cavity mode results in a coherent interaction between them, leading to spectrally resolved superradiant and subradiant states. We use the electronic spin degrees of freedom of the SiV centers to control these optically mediated interactions. Such controlled interactions will be crucial in developing cavity-mediated quantum gates between spin qubits and for realizing scalable quantum network nodes. %B Science %V 362 %P 662-665 %G eng %U http://science.sciencemag.org/content/362/6415/662 %N 6415 %0 Journal Article %J Optica %D 2018 %T Ultrahigh-efficiency wavelength conversion in nanophotonic periodically poled lithium niobate waveguides %A Wang, Cheng %A Carsten Langrock %A Alireza Marandi %A Marc Jankowski %A Zhang, Mian %A Boris Desiatov %A Martin M. Fejer %A Lončar, Marko %X Periodically poled lithium niobate (PPLN) waveguides are a powerful platform for efficient wavelength conversion. Conventional PPLN converters, however, typically require long device lengths and high pump powers due to the limited nonlinear interaction strength. Here we use a nanostructured PPLN waveguide to demonstrate an ultrahigh normalized efficiency of 2600%/W−cm^2 for second-harmonic generation of 1.5 μm radiation, more than 20 times higher than that in state-of-the-art diffused waveguides. This is achieved by a combination of sub-wavelength optical confinement and high-fidelity periodic poling at a first-order poling period of 4 μm. Our highly integrated PPLN waveguides are promising for future chip-scale integration of classical and quantum photonic systems. %B Optica %V 5 %P 1438 %G eng %U https://www.osapublishing.org/optica/abstract.cfm?uri=optica-5-11-1438 %N 11 %0 Journal Article %J Nature %D 2018 %T Integrated lithium niobate electro-optic modulators operating at CMOS-compatible voltages %A Wang, Cheng %A Zhang, Mian %A Chen, Xi %A Maxime Bertrand %A Amirhassan Shams-Ansari %A Sethumadhavan Chandrasekhar %A Peter Winzer %A Loncar, Marko %X Electro-optic modulators translate high-speed electronic signals into the optical domain and are critical components in modern telecommunication networks1,2 and microwave-photonic systems3,4. They are also expected to be building blocks for emerging applications such as quantum photonics5,6 and non-reciprocal optics7,8. All of these applications require chip-scale electro-optic modulators that operate at voltages compatible with complementary metal–oxide–semiconductor (CMOS) technology, have ultra-high electro-optic bandwidths and feature very low optical losses. Integrated modulator platforms based on materials such as silicon, indium phosphide or polymers have not yet been able to meet these requirements simultaneously because of the intrinsic limitations of the materials used. On the other hand, lithium niobate electro-optic modulators, the workhorse of the optoelectronic industry for decades9, have been challenging to integrate on-chip because of difficulties in microstructuring lithium niobate. The current generation of lithium niobate modulators are bulky, expensive, limited in bandwidth and require high drive voltages, and thus are unable to reach the full potential of the material. Here we overcome these limitations and demonstrate monolithically integrated lithium niobate electro-optic modulators that feature a CMOS-compatible drive voltage, support data rates up to 210 gigabits per second and show an on-chip optical loss of less than 0.5 decibels. We achieve this by engineering the microwave and photonic circuits to achieve high electro-optical efficiencies, ultra-low optical losses and group-velocity matching simultaneously. Our scalable modulator devices could provide cost-effective, low-power and ultra-high-speed solutions for next-generation optical communication networks and microwave photonic systems. Furthermore, our approach could lead to large-scale ultra-low-loss photonic circuits that are reconfigurable on a picosecond timescale, enabling a wide range of quantum and classical applications5,10,11 including feed-forward photonic quantum computation. %B Nature %G eng %U https://www.nature.com/articles/s41586-018-0551-y %0 Journal Article %J Physical Review Applied %D 2018 %T Spectral alignment of single-photon emitters in diamond using strain gradient %A Smarak Maity %A Shao, Linbo %A Sohn, Young-Ik %A Meesala, Srujan %A Bartholomeus Machielse %A Edward Bielejec %A Matthew Markha %A Loncar, Marko %B Physical Review Applied %V 10 %P 024050 %G eng %U https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.10.024050 %0 Journal Article %J Physical Review Letters %D 2018 %T Cavity-enhanced Raman emission from a single color center in a solid %A Shuo Sun %A Jingyuan Linda Zhang %A Kevin A. Fischer %A Michael J. Burek %A Constantin Dory %A Konstantinos G. Lagoudakis %A Yan-Kai Tzeng %A Marina Radulaski %A Yousif Kelaita %A Amir Safavi-Naeini %A Zhi-Xun Shen %A Nicholas A. Melosh %A Steven Chu %A Lončar, Marko %A Vučković, Jelena %B Physical Review Letters %V 121 %P 083601 %8 18 Apr 2018 %G eng %U https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.083601 %0 Journal Article %J Optics Letters %D 2018 %T High-Q chaotic lithium niobate microdisk cavity %A Wang, Li %A Wang, Cheng %A Wang, Jie %A Fang Bo %A Zhang, Mian %A Gong, Qihuang %A Lončar, Marko %A Xiao, Yun-Feng %B Optics Letters %V 43 %P 2917-2920 %G eng %U https://www.osapublishing.org/ol/abstract.cfm?uri=ol-43-12-2917 %N 12 %0 Journal Article %J Physical Review B %D 2018 %T Strain engineering of the silicon vacancy center in diamond %A Meesala*, Srujan %A Sohn*, Young-Ik %A Benjamin Pingault %A Shao, Linbo %A Haig A. Atikian %A Holzgrafe, Jeffrey %A Mustafa Gündoğan %A Camille Stavrakas %A Sipahigil, Alp %A Cleaven Chia %A Evans, Ruffin %A Michael J. Burek %A Zhang, Mian %A Lue Wu %A Jose L. Pacheco %A John Abraham %A Edward Bielejec %A Mikhail D. Lukin %A Mete Atatüre %A Lončar, Marko %X
We control the electronic structure of the silicon-vacancy (SiV) color-center in diamond by changing its static strain environment with a nano-electro-mechanical system. This allows deterministic and local tuning of SiV optical and spin transition frequencies over a wide range, an essential step towards multi-qubit networks. In the process, we infer the strain Hamiltonian of the SiV revealing large strain susceptibilities of order 1 PHz/strain for the electronic orbital states. We identify regimes where the spin-orbit interaction results in a large strain suseptibility of order 100 THz/strain for spin transitions, and propose an experiment where the SiV spin is strongly coupled to a nanomechanical resonator.
%B Physical Review B %V 97 %P 205444 %G eng %U https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.205444 %0 Journal Article %J Physical Review Letters %D 2018 %T Phonon networks with SiV centers in diamond waveguides %A Marc-Antoine Lemonde %A Meesala, Srujan %A Sipahigil, Alp %A Martin J. A. Schuetz %A Mikhail D. Lukin %A Loncar, Marko %A Peter Rabl %B Physical Review Letters %V 120 %P 213603 %G eng %U https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.213603 %0 Manuscript %D 2018 %T Controlling the coherence of a diamond spin qubit through its strain environment %A Sohn*, Young-Ik %A Meesala*, Srujan %A Benjamin Pingault* %A Haig A. Atikian %A Holzgrafe, Jeffrey %A Mustafa Gündoğan %A Camille Stavrakas %A Megan J. Stanley %A Sipahigil, Alp %A Joonhee Choi %A Zhang, Mian %A Jose L. Pacheco %A John Abraham %A Edward Bielejec %A Mikhail D. Lukin %A Mete Atatüre %A Lončar, Marko %X
The uncontrolled interaction of a quantum system with its environment is detrimental for quantum coherence. In the context of solid-state qubits, techniques to mitigate the impact of fluctuating electric and magnetic fields from the environment are well-developed. In contrast, suppression of decoherence from thermal lattice vibrations is typically achieved only by lowering the temperature of operation. Here, we use a nano-electro-mechanical system (NEMS) to mitigate the effect of thermal phonons on a solid-state quantum emitter without changing the system temperature. We study the silicon-vacancy (SiV) colour centre in diamond which has optical and spin transitions that are highly sensitive to phonons. First, we show that its electronic orbitals are highly susceptible to local strain, leading to its high sensitivity to phonons. By controlling the strain environment, we manipulate the electronic levels of the emitter to probe, control, and eventually, suppress its interaction with the thermal phonon bath. Strain control allows for both an impressive range of optical tunability and significantly improved spin coherence. Finally, our findings indicate that it may be possible to achieve strong coupling between the SiV spin and single phonons, which can lead to the realisation of phonon-mediated quantum gates and nonlinear quantum phononics.
%B Nature Communications %V 9 %P 2012 %G eng %U https://www.nature.com/articles/s41467-018-04340-3 %0 Journal Article %J Physical Review Applied %D 2018 %T Topology Optimized Multi-layered Meta-optics %A Lin, Zin %A Benedikt Groever %A Federico Capasso %A Alejandro W. Rodriguez %A Lončar, Marko %B Physical Review Applied %V 9 %P 044030 %G eng %U https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.9.044030 %0 Journal Article %J ACS Photonics %D 2018 %T All-Polymer Integrated Optical Resonators by Roll-to-Roll Nanoimprint Lithography %A Shneidman, Anna V. %A Kaitlyn P. Becker %A Michael A. Lukas %A Nicholas Torgerson %A Wang, Cheng %A Reshef, Orad %A Michael J. Burek %A Kateri Paul %A Joseph McLellan %A Loncar, Marko %B ACS Photonics %G eng %U https://pubs.acs.org/doi/full/10.1021/acsphotonics.8b00022 %0 Journal Article %J Physical Review B %D 2018 %T Topology-optimized Dual-Polarization Dirac Cones %A Lin, Zin %A Lysander Christakis %A Li, Yang %A Mazur, Eric %A Alejandro W. Rodriguez %A Lončar, Marko %B Physical Review B %V 97 %P 081408(R) %G eng %U https://arxiv.org/abs/1705.03574 %0 Journal Article %J Nano Letters %D 2018 %T Strongly Cavity-Enhanced Spontaneous Emission from Silicon-Vacancy Centers in Diamond %A Jingyuan Linda Zhang %A Shuo Sun %A Burek, Michael J %A Constantin Dory %A Yan-Kai Tzeng %A Kevin A Fischer %A Yousif Kelaita %A Konstantinos G Lagoudakis %A Marina Radulaski %A Zhi-Xun Shen %A Nicholas A Melosh %A Steven Chu %A Loncar, Marko %A Vuckovic, Jelena %B Nano Letters %V 18 %P 1360-1365 %G eng %U https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b05075 %N 2 %0 Journal Article %J Optics Express %D 2018 %T Nanophotonic Lithium Niobate Electro-optic Modulators %A Wang, Cheng %A Zhang, Mian %A Brian Stern %A Lipson, Michal %A Loncar, Marko %B Optics Express %V 26 %P 1547-1555 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-26-2-1547 %N 2 %0 Journal Article %J Optics Letters Vol. 43, Issue 2, pp. 318-321 (2018) %D 2018 %T An integrated diamond Raman laser pumped in the near-visible %A Latawiec, Pawel %A Venkataraman, Vivek %A Amirhassan Shams-Ansari %A Markham, Matthew %A Loncar, Marko %X Using a high-Q diamond microresonator (Q > 300,000) interfaced with high-power-handling directly-written doped-glass waveguides, we demonstrate a Raman laser in an integrated platform pumped in the near-visible. Both TM-to-TE and TE-to-TE lasing is observed, with a Raman lasing threshold as low as 20 mW and Stokes power of over 1 mW at 120 mW pump power. Stokes emission is tuned over a 150 nm (60 THz) bandwidth around 875 nm wavelength, corresponding to 17.5% of the center frequency. %B Optics Letters Vol. 43, Issue 2, pp. 318-321 (2018) %G eng %U https://arxiv.org/abs/1712.04385 %0 Journal Article %J Optica %D 2017 %T Monolithic Ultrahigh-Q Lithium Niobate Microring Resonator %A Zhang, Mian %A Wang, Cheng %A Rebecca Cheng %A Amirhassan Shams-Ansari %A Loncar, Marko %B Optica %V 4 %P 1536-1537 %8 12/18/2017 %G eng %U https://www.osapublishing.org/optica/abstract.cfm?uri=optica-4-12-1536 %N 12 %0 Journal Article %J Nature Communications %D 2017 %T Metasurface-assisted phase-matching-free second harmonic generation in lithium niobate waveguides %A Wang, Cheng %A Zhaoyi Li %A Myoung-Hwan Kim %A Xiao Xiong %A Xi-Feng Ren %A Guang-Can Guo %A Nanfang Yu %A Loncar, Marko %B Nature Communications %V 8 %P 2098 %G eng %U https://www.nature.com/articles/s41467-017-02189-6 %0 Journal Article %J Applied Physics Letters %D 2017 %T Mechanical and optical nanodevices in single-crystal quartz %A Sohn, Young-Ik %A Rachel Miller %A Venkataraman, Vivek %A Lončar, Marko %X

Single-crystal α-quartz, one of the most widely used piezoelectric materials, has enabled a wide range of timing applications. Owing to the fact that integrated thin-film based quartz platform is not available, most of these applications rely on macroscopic, bulk crystal-based devices. Here we show that the Faraday cage angled-etching technique can be used to realize nanoscale electromechanical and photonic devices in quartz. Using this approach, we demonstrate quartz nanomechanical cantilevers and ring resonators featuring Qs of 4,900 and 8,900, respectively.

%B Applied Physics Letters %V 111 %P 263103 %G eng %U http://aip.scitation.org/doi/full/10.1063/1.5008759 %0 Journal Article %J APL Photonics %D 2017 %T Robust nano-fabrication of an integrated platform for spin control in a tunable microcavity %A Stefan Bogdanovic %A Madelaine S.Z. Liddy %A Suzanne B. van Dam %A Lisanne C. Coenen %A Thomas Fink %A Loncar, Marko %A Ronald Hanson %B APL Photonics %V 2 %P 126101 %G eng %U http://aip.scitation.org/doi/abs/10.1063/1.5001144 %0 Journal Article %J Science %D 2017 %T Chaos-assisted broadband momentum transformation in optical microresonators %A Jiang, Xuefeng %A Shao, Linbo %A Zhang, Shu-Xin %A Yi, Xu %A Wiersig, Jan %A Wang, Li %A Gong, Qihuang %A Loncar, Marko %A Yang, Lan %A Xiao, Yun-Feng %B Science %I American Association for the Advancement of Science %V 358 %P 344–347 %G eng %U http://science.sciencemag.org/content/358/6361/344 %N 6361 %R 10.1126/science.aao0763 %0 Journal Article %J ACS Photonics %D 2017 %T Direct Observation of Phase-Free Propagation in a Silicon Waveguide %A Reshef, Orad %A Philip Camayd-Muñoz %A Daryl I. Vulis %A Li, Yang %A Marko Lonc̆ar %A Mazur, Eric %B ACS Photonics %V 4 %P 2385–2389 %G eng %U http://pubs.acs.org/doi/abs/10.1021/acsphotonics.7b00760 %N 10 %0 Journal Article %J Physical Review A %D 2017 %T Efficient quantum microwave-to-optical conversion using electro-optic nanophotonic coupled resonators %A Mohammad Soltani %A Zhang, Mian %A Colm Ryan %A Guilhem J. Ribeill %A Wang, Cheng %A Loncar, Marko %B Physical Review A %V 96 %P 043808 %G eng %U https://journals.aps.org/pra/abstract/10.1103/PhysRevA.96.043808 %0 Journal Article %J Physical Review Applied %D 2017 %T Fiber-Coupled Diamond Quantum Nanophotonic Interface %A Michael J. Burek %A Charles Meuwly %A Ruffin E. Evans %A Mihir K. Bhaskar %A Sipahigil, Alp %A Meesala, Srujan %A Bartholomeus Machielse %A Denis D. Sukachev %A Christian T. Nguyen %A Jose L. Pacheco %A Edward Bielejec %A Mikhail D. Lukin %A Lončar, Marko %B Physical Review Applied %V 8 %P 024026 %8 25 Aug, 2017 %G eng %U https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.8.024026 %N 2 %0 Journal Article %J Optics Letters %D 2017 %T Topology optimization of multi-track ring resonators and 2D microcavities for nonlinear frequency conversion %A Lin, Zin %A Lončar, Marko %A Alejandro W. Rodriguez %B Optics Letters %V 42 %P 2818-2821 %G eng %U https://www.osapublishing.org/ol/abstract.cfm?uri=ol-42-14-2818 %N 14 %0 Journal Article %J Physical Review Letters %D 2017 %T Quantum Nonlinear Optics with a Germanium-Vacancy Color Center in a Nanoscale Diamond Waveguide %A Mihir K. Bhaskar %A Denis D. Sukachev %A Sipahigil, Alp %A Ruffin E. Evans %A Michael J. Burek %A Christian T. Nguyen %A Lachlan J. Rogers %A Siyushev, Petr %A Mathias H. Metsch %A Park, Hongkun %A Jelezko, Fedor %A Lončar, Marko %A Mikhail D. Lukin %B Physical Review Letters %V 118 %P 223603 %8 May 31, 2017 %G eng %U https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.223603 %0 Journal Article %J Optics Express %D 2017 %T Monolithic CMOS-compatible zero-index metamaterials %A Daryl I. Vulis %A Li, Yang %A Reshef, Orad %A Philip Camayd-Muñoz %A Yin, Mei %A Kita, Shota %A Lončar, Marko %A Mazur, Eric %B Optics Express %V 25 %P 12381-12399 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-11-12381 %N 11 %0 Journal Article %J Nature Communications %D 2017 %T Large-scale quantum-emitter arrays in atomically thin semiconductors %A Carmen Palacios-Berraquero %A Dhiren M. Kara %A Alejandro R.-P. Montblanch %A Matteo Barbone %A Latawiec, Pawel %A Duhee Yoon %A Anna K. Ott %A Lončar, Marko %A Andrea C. Ferrari %A Mete Atature %B Nature Communications %V 8 %P 15093 %G eng %U https://www.nature.com/articles/ncomms15093 %0 Journal Article %J Applied Physics Letters %D 2017 %T Design and low-temperature characterization of a tunable microcavity for diamond-based quantum networks %A S. Bogdanovic %A S.B. van Dam %A C. Bonato %A L.C. Coenen %A A.J. Zwerver %A B. Hensen %A M.S.Z. Liddy %A T. Fink %A A. Reiserer %A Loncar, M. %A R. Hanson %X

Freestanding diamond nanostructures are etched from a bulk diamond substrate and integrated with evanescently coupled superconducting nanowire single-photon detectors.

%B Applied Physics Letters %V 110 %P 171103 %G eng %U http://aip.scitation.org/doi/full/10.1063/1.4982168 %0 Journal Article %J Nature Nanotechnology %D 2017 %T Controlling propagation and coupling of waveguide modes using phase-gradient metasurfaces %A Zhaoyi Li %A Myoung-Hwan Kim %A Wang, Cheng %A Zhaohong Han %A Sajan Shrestha %A Adam Christopher Overvig %A Ming Lu %A Aaron Stein %A Anuradha Murthy Agarwal %A Lončar, Marko %A Nanfang Yu %B Nature Nanotechnology %V 12 %G eng %U http://www.nature.com/nnano/journal/vaop/ncurrent/full/nnano.2017.50.html %N 5 %0 Journal Article %J Optics Express %D 2017 %T On-chip all-dielectric fabrication-tolerant zero-index metamaterials %A Kita, Shota %A Li, Yang %A Muñoz, Philip %A Reshef, Orad %A Daryl I. Vulis %A Robert W. Day %A Mazur, Eric %A Lončar, Marko %X

Zero-index metamaterials (ZIMs) offer unprecedented ways to manipulate the flow of light, and are of interest for wide range of applications including optical cloaking, super-coupling, and unconventional phase-matching properties in nonlinear optics. Impedance-matched ZIMs can be obtained through a photonic Dirac-cone (PDC) dispersion induced by an accidental degeneracy of an electric monopole and a transverse magnetic dipole mode at the center of the Brillouin zone. Therefore, PDC is very sensitive to fabrication imperfections. In this work, we propose and demonstrate fabrication-tolerant all-dielectric ZIM in telecom regime that supports near PDC dispersion over much wider parameter space than conventional designs. The prism device integrated with Si photonics is fabricated and measured for the verification.

%B Optics Express %V 25 %P 8326-8334 %G eng %U https://doi.org/10.1364/OE.25.008326 %N 7 %0 Journal Article %J SPIE Newsroom %D 2017 %T Novel fabrication of diamond nanophotonics coupled to single-photon detectors %A Atikian, Haig %A Meesala, Srujan %A Burek, Michael %A Sohn, Young-Ik %A Israelian, Johan %A Patri, Adarsh %A Clarke, Nigel %A Sipahigil, Alp %A Evans, Ruffin %A Sukachev, Denis %A Westervelt, Robert %A Lukin, Mikhail %A Loncar, Marko %X

Freestanding diamond nanostructures are etched from a bulk diamond substrate and integrated with evanescently coupled superconducting nanowire single-photon detectors.

%B SPIE Newsroom %8 03/22/2017 %G eng %U http://spie.org/newsroom/6765-novel-fabrication-of-diamond-nanophotonics-coupled-to-single-photon %0 Journal Article %J Optics Express %D 2017 %T Second harmonic generation in nano-structured thin-film lithium niobate waveguides %A Wang, Cheng %A Xiao Xiong %A Nicolas Andrade %A Venkataraman, Vivek %A Xi-Feng Ren %A Guang-Can Guo %A Lončar, Marko %B Optics Express %V 25 %P 6963-6973 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-6-6963 %N 6 %0 Journal Article %J Optical Materials Express %D 2017 %T Hybrid nanodiamond and titanium dioxide nanobeam cavity design %A Kelvin Chung %A Timothy J. Karle %A Wang, Cheng %A Lončar, Marko %A Snjezana Tomljenovic-Hanic %B Optical Materials Express %V 7 %P 785-792 %G eng %U https://www.osapublishing.org/ome/abstract.cfm?uri=ome-7-3-785 %N 3 %0 Journal Article %J APL Photonics %D 2017 %T Freestanding nanostructures via reactive ion beam angled etching %A Haig A. Atikian %A Latawiec, Pawel %A Michael J. Burek %A Sohn, Young-Ik %A Meesala, Srujan %A Normand Gravel %A Ammar B. Kouki %A Loncar, Marko %B APL Photonics %V 2 %P 051301 %G eng %U http://aip.scitation.org/doi/abs/10.1063/1.4982603 %0 Journal Article %J Optics Letters %D 2017 %T Competition between Raman and Kerr effects in microresonator comb generation %A Yoshitomo Okawachi %A Mengjie Yu %A Venkataraman, Vivek %A Pawel M. Latawiec %A Austin G. Griffith %A Lipson, Michal %A Lončar, Marko %A Alexande Gaeta %B Optics Letters %V 42 %P 2786-2789 %G eng %U https://www.osapublishing.org/ol/abstract.cfm?URI=ol-42-14-2786 %N 14 %0 Journal Article %J Physical Review Applied %D 2016 %T Diamond Radio Receiver: Nitrogen-Vacancy Centers as Fluorescent Transducers of Microwave Signals %A Shao, Linbo %A Zhang, Mian %A Markham, Matthew %A Andrew M. Edmonds %A Lončar, Marko %B Physical Review Applied %V 6 %P 064008 %8 2016 %G eng %U https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.6.064008 %0 Journal Article %J Optica %D 2016 %T Diamond optomechanical crystals %A Michael J. Burek %A Justin D. Cohen %A Seán M. Meenehan %A Nayera El-Sawah %A Cleaven Chia %A Thibaud Ruelle %A Meesala, Srujan %A Rochman, Jake %A Haig A. Atikian %A Markham, Matthew %A Daniel J. Twitchen %A Mikhail D. Lukin %A Painter, Oskar %A Lončar, Marko %B Optica %V 3 %P 1404-1411 %8 18 Nov., 2016 %G eng %U https://www.osapublishing.org/optica/abstract.cfm?URI=optica-3-12-1404 %N 12 %0 Journal Article %J Science %D 2016 %T An Integrated Diamond nanophotonics platform for quantum-optical networks %A Sipahigil, Alp %A Ruffin E. Evans %A Denis D. Sukachev %A Michael J. Burek %A Johannes Borregaard %A Mihir K. Bhaskar %A Christian T. Nguyen %A Jose L. Pacheco %A Haig A. Atikian %A Charles Meuwly %A Ryan M. Camacho %A Jelezko, Fedor %A Edward Bielejec %A Park, Hongkun %A Lončar, Marko %A Mikhail D. Lukin %B Science %V 354 %P 847 %8 18 Nov., 2016 %G eng %U http://science.sciencemag.org/content/354/6314/847.abstract %N 6314 %0 Journal Article %J Physical Review Letters %D 2016 %T Enhanced spontaneous emission at third-order dirac exceptional points in inverse-designed photonic crystals %A Lin, Zin %A Adi Pick %A Lončar, Marko %A Alejandro W. Rodriguez %B Physical Review Letters %V 117 %P 107402 %8 30 Aug, 2016 %G eng %U https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.107402 %N 10 %0 Journal Article %J Advanced Optical Materials %D 2016 %T Wide-Field Optical Microscopy of Microwave Fields Using Nitrogen-Vacancy Centers in Diamonds %A Shao, Linbo %A Liu, Ruishan %A Zhang, Mian %A Shneidman, Anna V. %A Audier, Xavier %A Markham, Matthew %A Dhillon, Harpreet %A Daniel J. Twitchen %A Xiao, Yun-Feng %A Lončar, Marko %K microwave fields %K nitrogen-vacancy centers in diamond %K optical microscopy %K optically detected magnetic resonance %K wide-field imaging %B Advanced Optical Materials %V 4 %P 1075 %G eng %U http://dx.doi.org/10.1002/adom.201600039 %R 10.1002/adom.201600039 %0 Journal Article %J Light: Science and Applications %D 2016 %T Measurement of bound states in the continuum by a detector embedded in a photonic crysta %A Roman Gansch %A Kalchmair, Stefan %A Patrice Genevet %A Tobias Zederbauer %A Hermann Detz %A Aaron M Andrews %A Werner Schrenk %A Federico Capasso %A Loncar, Marko %A Gottfried Strasser %B Light: Science and Applications %V 5 %P e16147 %G eng %U http://www.nature.com/lsa/journal/v5/n9/full/lsa2016147a.html %N 9 %0 Journal Article %J Applied Physics Letters %D 2016 %T 10 nm gap bowtie plasmonic apertures fabricated by modified lift-off process %A Huang, I-Chun %A Holzgrafe, Jeffrey %A Jensen, Russell A. %A Choy, Jennifer T. %A Bawendi, Moungi G. %A Lončar, Marko %B Applied Physics Letters %V 109 %G eng %U http://scitation.aip.org/content/aip/journal/apl/109/13/10.1063/1.4963689 %N 13 %R http://dx.doi.org/10.1063/1.4963689 %0 Journal Article %J Optica %D 2016 %T Cavity-enhanced second harmonic generation via nonlinear-overlap optimization %A Lin, Zin %A Liang, Xiangdong %A Loncar, Marko %A Johnson, Steven G %A Rodriguez, Alejandro W %B Optica %V 3 %P 233 %G eng %U https://www.osapublishing.org/optica/abstract.cfm?uri=optica-3-3-233 %N 3 %0 Journal Article %J Phys. Rev. Applied %D 2016 %T Enhanced strain coupling of nitrogen vacancy spins to nanoscale diamond cantilevers %A Meesala, Srujan %A Sohn, Young-Ik %A Atikian, Haig A %A Kim, Samuel %A Burek, Michael J %A Choy, Jennifer T %A Lončar, Marko %B Phys. Rev. Applied %V 5 %G eng %U https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.5.034010 %N 034010 %0 Journal Article %J Journal of Vacuum Science & Technology B %D 2016 %T Faraday cage angled-etching of nanostructures in bulk dielectrics %A Latawiec, Pawel %A Michael J. Burek %A Sohn, Young-Ik %A Loncar, Marko %B Journal of Vacuum Science & Technology B %V 34 %P 041801 %G eng %U http://scitation.aip.org/content/avs/journal/jvstb/34/4/10.1116/1.4944854 %0 Journal Article %J ACS Photonics %D 2016 %T Optical trapping and two-photon excitation of colloidal quantum dots using bow-tie apertures %A Jensen*, Russell %A Huang*, I-Chun %A Chen, Ou %A Choy, Jennifer %A Bischof, Thomas S. %A Lončar, Marko %A Bawendi, Moungi %B ACS Photonics %V 3 %P 423 %G eng %U http://pubs.acs.org/doi/abs/10.1021/acsphotonics.5b00575 %N 3 %0 Journal Article %J Scientific Reports %D 2016 %T Tuning and freezing disorder in 3D photonic crystals using partial wetting and drying %A Burgess, Ian B %A Abedzadeh, Navid %A Kay, Theresa M %A Shneidman, Anna V %A Cranshaw, Derek J %A Loncar, Marko %A Aizenberg, Joanna %B Scientific Reports %V 6 %P 19542 %G eng %U http://www.nature.com/articles/srep19542?trendmd-shared=0 %0 Journal Article %J Applied Physics Letters %D 2016 %T Waveguide-loaded silica fibers for coupling to high-index micro-resonators %A Latawiec, Pawel %A Burek, Michael J, %A Venkataraman, Vivek %A Lončar, Marko %B Applied Physics Letters %V 108 %G eng %U http://scitation.aip.org/content/aip/journal/apl/108/3/10.1063/1.4940021 %R http://dx.doi.org/10.1063/1.4940021 %0 Journal Article %J Annalen der Physik %D 2015 %T Classical and fluctuation‐induced electromagnetic interactions in micron‐scale systems: designer bonding, antibonding, and Casimir forces %A Rodriguez, Alejandro W %A Hui, Pui‐Chuen %A Woolf, David P %A Johnson, Steven G %A Lončar, Marko %A Federico Capasso %B Annalen der Physik %V 527 %P 45-80 %@ 1521-3889 %G eng %U http://onlinelibrary.wiley.com/doi/10.1002/andp.201400160/abstract %0 Journal Article %J Optics express %D 2015 %T Design of diamond microcavities for single photon frequency down-conversion %A Lin, Zin %A Johnson, Steven G %A Rodriguez, Alejandro W %A Loncar, M. %B Optics express %V 23 %P 25279-25294 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-23-19-25279&origin=search %N 19 %0 Journal Article %J Optics letters %D 2015 %T Design of nano-groove photonic crystal cavities in lithium niobate %A Li, Yihang %A Wang, Cheng %A Loncar, Marko %B Optics letters %V 40 %P 2902-2905 %@ 1539-4794 %G eng %U https://www.osapublishing.org/ol/abstract.cfm?uri=ol-40-12-2902&origin=search %0 Journal Article %J Applied Physics Letters %D 2015 %T Dynamic Actuation of Single-Crystal Diamond Nanobeams %A Sohn, Young-Ik %A Burek, Michael J %A Kara, Vural %A Kearns, Ryan %A Lončar, Marko %B Applied Physics Letters %V 107 %P 243106 %G eng %U http://scitation.aip.org/content/aip/journal/apl/107/24/10.1063/1.4937625 %0 Journal Article %J Optics express %D 2015 %T High tuning stability of sampled grating quantum cascade lasers %A Kalchmair, Stefan %A Blanchard, Romain %A Mansuripur, Tobias S %A de Naurois, Guy-Mael %A Pfluegl, Christian %A Witinski, Mark F %A Diehl, Laurent %A Federico Capasso %A Loncar, Marko %B Optics express %V 23 %P 15734-15747 %@ 1094-4087 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-23-12-15734&origin=search %0 Journal Article %J Nano letters %D 2015 %T Nanofluidics of Single-crystal Diamond Nanomechanical Resonators %A Kara, Vural %A Sohn, Young-Ik %A Atikian, Haig %A Yakhot, Victor %A Loncar, Marko %A Ekinci, Kamil L %B Nano letters %V 15 %P 8070-8076 %@ 1530-6984 %G eng %U http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.5b03503?journalCode=nalefd %0 Journal Article %J Optica %D 2015 %T On-chip diamond Raman laser %A Latawiec, Pawel %A Venkataraman, Vivek %A Burek, Michael J %A Hausmann, Birgit JM %A Bulu, Irfan %A Lončar, Marko %B Optica %V 2 %P 924-928 %@ 2334-2536 %G eng %U https://www.osapublishing.org/optica/abstract.cfm?uri=optica-2-11-924 %0 Journal Article %J Nature Photonics %D 2015 %T On-chip zero-index metamaterials %A Li, Yang %A Kita, Shota %A Muñoz, Philip %A Reshef, Orad %A Vulis, Daryl I %A Yin, Mei %A Lončar, Marko %A 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Y. %A Floyd, Daniel L %A Loncar, Marko %B Optics Express %V 19 %P 22191-22197 %@ 1094-4087 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-19-22-22191 %0 Journal Article %J Applied Physics Letters %D 2011 %T High-Q transverse-electric/transverse-magnetic photonic crystal nanobeam cavities %A McCutcheon, Murray W %A Deotare, Parag B %A Zhang, Yinan %A Lončar, Marko %B Applied Physics Letters %V 98 %P 111117 %@ 0003-6951 %G eng %U http://scitation.aip.org/content/aip/journal/apl/98/11/10.1063/1.3568897 %0 Journal Article %J Optics Express %D 2011 %T High-Q/V air-mode photonic crystal cavities at microwave frequencies %A Zhang, Yinan %A Bulu, Irfan %A Tam, Wai-Ming %A Levitt, Ben %A Shah, Jagdish %A Botto, Tancredi %A Loncar, Marko %B Optics Express %V 19 %P 9371-9377 %@ 1094-4087 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-19-10-9371 %0 Journal Article %J Optics Express %D 2011 %T Mid-infrared photonic crystal cavities in silicon %A Shankar, Raji %A Leijssen, Rick %A Bulu, Irfan %A Lončar, Marko %B Optics Express %V 19 %P 5579-5586 %@ 1094-4087 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-19-6-5579 %0 Journal Article %J Optics Letters %D 2011 %T Photonic crystal disk lasers %A Zhang, Yinan %A Hamsen, Christoph %A Choy, Jennifer T %A Huang, Yong %A Ryou, Jae-Hyun %A Dupuis, Russell D %A Loncar, Marko %B Optics Letters %V 36 %P 2704-2706 %@ 1539-4794 %G eng %U https://www.osapublishing.org/ol/abstract.cfm?uri=ol-36-14-2704 %0 Journal Article %J Optics Express %D 2011 %T Plasmonic resonators for enhanced diamond NV-center single photon sources %A Bulu, Irfan %A Babinec, Thomas %A Hausmann, Birgit %A Choy, Jennifer T %A Loncar, Marko %B Optics Express %V 19 %P 5268-5276 %@ 1094-4087 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-19-6-5268 %0 Journal Article %J New Journal of Physics %D 2011 %T Single-color centers implanted in diamond nanostructures %A Hausmann, Birgit JM %A Babinec, Thomas M %A Choy, Jennifer T %A Hodges, Jonathan S %A Hong, Sungkun %A Bulu, Irfan %A Yacoby, Amir %A Mikhail D. Lukin %A Lončar, Marko %B New Journal of Physics %V 13 %P 045004 %@ 1367-2630 %G eng %U http://iopscience.iop.org/article/10.1088/1367-2630/13/4/045004/meta;jsessionid=E73F0957F6ABA89DCB2F605DA344B2EB.c4.iopscience.cld.iop.org %0 Journal Article %J Optics Express %D 2011 %T Study of thermally-induced optical bistability and the role of surface treatments in Si-based mid-infrared photonic crystal cavities %A Shankar, Raji %A Bulu, Irfan %A Leijssen, Rick %A Lončar, Marko %B Optics Express %V 19 %P 24828-24837 %@ 1094-4087 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-19-24-24828 %0 Journal Article %J ACS Nano %D 2011 %T Wetting in color: Colorimetric differentiation of organic liquids with high selectivity %A Burgess, Ian B %A Koay, Natalie %A Raymond, Kevin P %A Kolle, Mathias %A Lončar, Marko %A Aizenberg, Joanna %B ACS Nano %V 6 %P 1427-1437 %@ 1936-0851 %G eng %U http://pubs.acs.org/doi/abs/10.1021/nn204220c %0 Journal Article %J Nature Nanotechnology %D 2010 %T A diamond nanowire single-photon source %A Babinec, Thomas M %A Hausmann, Birgit JM %A Khan, Mughees %A Zhang, Yinan %A Maze, Jeronimo R %A Hemmer, Philip R %A Lončar, Marko %B Nature Nanotechnology %V 5 %P 195-199 %@ 1748-3387 %G eng %U http://www.nature.com/nnano/journal/v5/n3/abs/nnano.2010.6.html %0 Journal Article %J Diamond and Related Materials %D 2010 %T Fabrication of diamond nanowires for quantum information processing applications %A Hausmann, Birgit JM %A Khan, Mughees %A Zhang, Yinan %A Babinec, Tom M %A Martinick, Katie %A McCutcheon, Murray %A Hemmer, Phil R %A Lončar, Marko %B Diamond and Related Materials %V 19 %P 621-629 %@ 0925-9635 %G eng %U http://www.sciencedirect.com/science/article/pii/S0925963510000312 %0 Journal Article %J Applied Physics Letters %D 2010 %T Photonic crystal nanobeam cavity strongly coupled to the feeding waveguide %A Qimin Quan %A Deotare, Parag %A Loncar, Marko %B Applied Physics Letters %V 96 %P 203102 %G eng %U http://scitation.aip.org/content/aip/journal/apl/96/20/10.1063/1.3429125 %N 203102 %0 Journal Article %J Optics Express %D 2010 %T Programmable photonic crystal nanobeam cavities %A Frank, Ian W %A Deotare, Parag B %A McCutcheon, Murray W %A Lončar, Marko %B Optics Express %V 18 %P 8705-8712 %@ 1094-4087 %G eng %U https://www.osapublishing.org/oe/abstract.cfm?uri=oe-18-8-8705 %0 Journal Article %J Applied Physics Letters %D 2010 %T Room-temperature photoresponse of Schottky photodiodes based on GaNxAs1− x synthesized by ion implantation and pulsed-laser melting %A Yi, Wei %A Kim, Taeseok %A Shalish, Ilan %A Loncar, Marko %A Michael J. Aziz %A Narayanamurti, Venkatesh %B Applied Physics Letters %V 97 %P 151103 %@ 0003-6951 %G eng %U http://scitation.aip.org/content/aip/journal/apl/97/15/10.1063/1.3500981 %0 Journal Article %J Optics Express %D 2009 %T Broadband frequency conversion and shaping of single photons emitted from a nonlinear cavity %A McCutcheon, Murray W %A Chang, Darrick E %A Zhang, Yinan %A Mikhail D. 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optical waveguides %A Adibi, Ali %A Xu, Yong %A Lee, Reginald K %A Loncar, Marko %A Yariv, Amnon %A Scherer, Axel %B Physical Review-Section B-Condensed MatterPhysical Review-Section B-Condensed Matter %V 64 %P 41102R %@ 0163-1829 %G eng %0 Journal Article %J Physical Review BPhysical Review B %D 2001 %T Role of distributed Bragg reflection in photonic-crystal optical waveguides %A Adibi, Ali %A Xu, Yong %A Lee, Reginald K %A Loncar, Marko %A Yariv, Amnon %A Scherer, Axel %B Physical Review BPhysical Review B %V 64 %P 041102 %G eng %0 Journal Article %J Journal of lightwave technologyJournal of lightwave technology %D 2000 %T Design and fabrication of silicon photonic crystal optical waveguides %A Lončar, Marko %A Doll, Theodor %A Vučković, Jelena %A Scherer, Axel %B Journal of lightwave technologyJournal of lightwave technology %V 18 %P 1402 %G eng %0 Journal Article %J Quantum Electronics, IEEE Journal ofQuantum Electronics, IEEE Journal of %D 2000 %T Surface plasmon enhanced light-emitting diode %A Vučković, Jelena %A Lončar, Marko %A Scherer, Axel %B Quantum Electronics, IEEE Journal ofQuantum Electronics, IEEE Journal of %V 36 %P 1131-1144 %@ 0018-9197 %G eng %0 Journal Article %J Applied Physics LettersApplied Physics Letters %D 2000 %T Waveguiding in planar photonic crystals %A Lončar, Marko %A Nedeljković, Dušan %A Doll, Theodor %A Vučković, Jelena %A Scherer, Axel %A Pearsall, Thomas P %B Applied Physics LettersApplied Physics Letters %V 77 %P 1937-1939 %@ 0003-6951 %G eng