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

Zhaoyi Li, Myoung Hwan Kim, Cheng Wang, Zhaohong Han, Sajan Shrestha, Adam Christopher Overvig, Ming Lu, Aaron Stein, Anuradha Murthy Agarwal, Marko Lončar, Nanfang Yu

Research output: Contribution to journalArticlepeer-review

283 Scopus citations


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.

Original languageEnglish
Pages (from-to)675-683
Number of pages9
JournalNature Nanotechnology
Issue number7
StatePublished - Jul 1 2017


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