Flat telescope based on an all-dielectric metasurface doublet enabling polarization-controllable enhanced beam steering.

ABSTRACT: A flat telescope (FTS), which incorporates an all-dielectric metasurface doublet (MD) based on hydrogenated amorphous silicon nanoposts, is proposed and demonstrated to achieve flexibly magnified angular beam steering that is sensitive to both light polarization and deflection direction. Specifically, for transverse-electric-polarized incident beams, the MD exhibits deflection magnification factors of +5 and +2, while for transverse magnetic polarization, the beam is steered in reverse to yield magnification factors of -5 and -2 in the horizontal and vertical directions, respectively. The proposed MD comprises cascaded metalenses, which can invoke polarization-selective transmission phases. The MD which emulates a set of convex and concave lenses renders positively increased beam deflectio

SUBMITTER: Li H 

PROVIDER: S-EPMC11501665 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature