Erik N. Knall, Can M. Knaut, Rivka Bekenstein, Daniel R. Assumpcao, Pavel L. Stroganov, Wenjie Gong, Yan Qi Huan, Pieter-Jan Stas, Bartholomeus Machielse, Michelle Chalupnik, David Levonian, Aziza Suleymanzade, Ralf Riedinger, Hongkun Park, Marko Lončar, Mihir K. Bhaskar, and Mikhail D. Lukin. Submitted. “Efficient Source of Shaped Single Photons Based on an Integrated Diamond Nanophotonic System.” arXiv, 2201.02731. [PDF]
Mengjie Yu, Christian Reimer, David Barton, Prashanta Kharel, Rebecca Cheng, Lingyan He, Linbo Shao, Di Zhu, Yaowen Hu, Hannah R. Grant, Leif Johansson, Yoshitomo Okawachi, Alexander L. Gaeta, Mian Zhang, and Marko Lončar. Submitted. “Femtosecond Pulse Generation via an Integrated Electro-Optic Time Lens.” arXiv, 2112.09204. [PDF]
Samantha I. Davis, Andrew Mueller, Raju Valivarthi, Nikolai Lauk, Lautaro Narváez, Boris Korzh, Andrew D. Beyer, Marco Colangelo, Karl K. Berggren, Matthew D. Shaw, Neil Sinclair, and Maria Spiropulu. Submitted. “Improved heralded single-photon source with a photon-number-resolving superconducting nanowire detector.” arXiv. Publisher's Version
Raju Valivarthi, Lautaro Narváez, Samantha I. Davis, Nikolai Lauk, Cristián Peña, Si Xie, Jason P. Allmaras, Andrew D. Beyer, Boris Korzh, Andrew Mueller, Mandy Rominsky, Matthew D. Shaw, Emma E. Wollman, Panagiotis Spentzouris, Daniel Oblak, Neil Sinclair, and Maria Spiropulu. Submitted. “Picosecond synchronization system for quantum networks.” arXiv. Publisher's Version
Amirhassan Shams-Ansari, Guanhao Huang, Lingyan He, Zihan Li, Jeffrey Holzgrafe, Marc Jankowski, Mikhail Churaev, Prashanta Kharel, Rebecca Cheng, Di Zhu, Neil Sinclair, Boris Desiatov, Mian Zhang, Tobias J. Kippenberg, and Marko Lončar. Submitted. “Reduced Material Loss in Thin-film Lithium Niobate Waveguides”. Publisher's VersionAbstract
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.
Di Zhu, Changchen Chen, Mengjie Yu, Linbo Shao, Yaowen Hu, C. J. Xin, Matthew Yeh, Soumya Ghosh, Lingyan He, Christian Reimer, Neil Sinclair, Franco N. C. Wong, Mian Zhang, and Marko Loncar. Submitted. “Spectral control of nonclassical light using an integrated thin-film lithium niobate modulator.” arXiv, 2112.09961. [PDF]
Marc Jankowski, Carsten Langrock, Boris Desiatov, Marko Loncar, and MM Fejer. Submitted. “Supercontinuum Generation by Saturated Interactions.” arXiv:1912.06642. Publisher's VersionAbstract
We demonstrate a new approach to supercontinuum generation and carrier-envelope-offset detection in dispersion-engineered nanophotonic waveguides based on saturated second-harmonic generation of femtosecond pulses. In contrast with traditional approaches based on self-phase modulation, this technique simultaneously broadens both harmonics by generating rapid amplitude modulations of the field envelopes. The generated supercontinuum produces coherent carrier-envelope-offset beatnotes in the overlap region that remain in phase across 100’s of nanometers of bandwidth while requiring <10 picojoules of pulse energy.
Benjamin Pingault, Bartholomeus Machielse, and Marko Loncar. Submitted. “Diamond Integrated Quantum Photonics (section 13 in Roadmap on Integrated Quantum Photonics).” arXiv. Publisher's Version [PDF]
Yaowen Hu, Mengjie Yu, Brandon Buscaino, Neil Sinclair, Di Zhu, Rebecca Cheng, Amirhassan Shams-Ansari, Linbo Shao, Mian Zhang, Joseph M. Kahn, and Marko Loncar. Submitted. “High-efficiency and broadband electro-optic frequency combs enabled by coupled micro-resonators.” arXiv, 2111.14743. Publisher's Version PDF
Yaowen Hu, Mengjie Yu, Neil Sinclair, Di Zhu, Rebecca Cheng, Cheng Wang, and Marko Loncar. Submitted. “Mirror-induced reflection in the frequency domain.” arXiv, 2203.17129. Publisher's Version
Linbo Shao, Sophie W. Ding, Neil Sinclair, and Marko Loncar. Submitted. “Thermal Modulation of Gigahertz Surface Acoustic Waves on Lithium Niobate.” arXiv, 2203.16003. Publisher's Version
Linbo Shao, Di Zhu, Marco Colangelo, Dae Hun Lee, Neil Sinclair, Yaowen Hu, Peter T. Rakich, Keji Lai, Karl K. Berggren, and Marko Loncar. 6/6/2022. “Electrical Control of Surface Acoustic Waves.” Nature Electronics. Publisher's Version
C. J. Xin, Jatadhari Mishra, Changchen Chen, Di Zhu, Amirhassan Shams-Ansari, Carsten Langrock, Neil Sinclair, Franco N. C. Wong, M. M. Fejer, and Marko Lončar. 5/26/2022. “Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate.” Optics Letters, 47, 11, Pp. 2830-2833. Publisher's VersionAbstract
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)%.
H. Atikian, N. Sinclair, P. Latawiec, X. Xiong, S. Meesala, S. Gauthier, D. Wintz, J. Randi, D. Bernot, S. DeFrances, J. Thomas, M. Roman, S. Durrant, F. Capasso, and M. Loncar. 5/11/2022. “Diamond mirrors for high-power continous-wave lasers.” Nature Communications, 13, Pp. 2610. Publisher's Version
Cleaven Chia, Bartholomeus Machielse, Amirhassan Shams-Ansari, and Marko Loncar. 4/12/2022. “Development of new hard masks for reactive ion beam angled etching of diamond.” Optics Express, 30, Pp. 14189. Publisher's Version [PDF]
Amirhassan Shams-Ansari, Mengjie Yu, Zaijun Chen, Christian Reimer, Mian Zhang, Nathalie Picqué, and Marko Lončar. 4/12/2022. “An integrated lithium-niobate electro-optic platform for spectrally tailored dual-comb spectroscopy.” Communications Physics, 5, Pp. 88. Publisher's VersionAbstract
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.
Amirhassan Shams-Ansari, Dylan Renaud, Rebecca Cheng, Linbo Shao, Lingyan He, Di Zhu, Mengjie Yu, Hannah R. Grant, Leif Johansson, Mian Zhang, and Marko Loncar. 4/6/2022. “Electrically pumped high power laser transmitter integrated on thin-film lithium niobate.” Optica, 9, Pp. 408. Publisher's VersionAbstract
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.
Keith Powell, Liwei Li, Amirhassan Shams-Ansari, Jianfu Wang, Debin Meng, Neil Sinclair, Jiangdong Deng, Marko Lončar, and Xiaoke Yi. 4/5/2022. “Integrated silicon carbide electro-optic modulator.” Nature Communications, 13, Pp. 1851. Publisher's Version
Smarak Maity*, Benjamin Pingault*, Graham Joe, Michelle Chalupnik, Daniel Assumpção, Eliza Cornell, Linbo Shao, and Marko Lončar. 3/23/2022. “Mechanical control of a single nuclear spin.” Physical Review X, 12, 1, Pp. 011056. Publisher's Version
Cristian Cortes, Pascal Lefebvre, Nikolai Lauk, Michael David, Neil Sinclair, Stephen Gray, and Daniel Oblak. 3/22/2022. “Sample-efficient adaptive calibration of quantum networks using Bayesian optimization.” Physical Review Applied, 17, Pp. 034067 . Publisher's Version