4 years ago

Controlling propagation and coupling of waveguide modes using phase-gradient metasurfaces

Controlling propagation and coupling of waveguide modes using phase-gradient metasurfaces
Cheng Wang, Aaron Stein, Adam Christopher Overvig, Myoung-Hwan Kim, Ming Lu, Marko Lončar, Zhaohong Han, Nanfang Yu, Anuradha Murthy Agarwal, Sajan Shrestha, Zhaoyi Li
Research on two-dimensional designer optical structures, or metasurfaces, has mainly focused on controlling the wavefronts of light propagating in free space. Here, we show that gradient metasurface structures consisting of phased arrays of plasmonic or dielectric nanoantennas can be used to control guided waves via strong optical scattering at subwavelength intervals. Based on this design principle, we experimentally demonstrate waveguide mode converters, polarization rotators and waveguide devices supporting asymmetric optical power transmission. We also demonstrate all-dielectric on-chip polarization rotators based on phased arrays of Mie resonators with negligible insertion losses. Our gradient metasurfaces can enable small-footprint, broadband and low-loss photonic integrated devices.

Publisher URL: http://dx.doi.org/10.1038/nnano.2017.50

DOI: 10.1038/nnano.2017.50

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