Independent phase modulation for quadruplex polarization channels enabled by chirality-assisted geometric-phase metasurfaces.

ABSTRACT: Geometric-phase metasurfaces, recently utilized for controlling wavefronts of circular polarized (CP) electromagnetic waves, are drastically limited to the cross-polarization modality. Combining geometric with propagation phase allows to further control the co-polarized output channel, nevertheless addressing only similar functionality on both co-polarized outputs for the two different CP incident beams. Here we introduce the concept of chirality-assisted phase as a degree of freedom, which could decouple the two co-polarized outputs, and thus be an alternative solution for designing arbitrary modulated-phase metasurfaces with distinct wavefront manipulation in all four CP output channels. Two metasurfaces are demonstrated with four arbitrary refraction wavefronts, and orbital angular mome

SUBMITTER: Yuan Y 

PROVIDER: S-EPMC7442839 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature