%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 LonĨar, 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