Design and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces.

ABSTRACT: We propose a new family of impedance-matched chiral metasurfaces that offer arbitrary polarization control at two different frequencies. To this end, two main problems are addressed: (1) determination of the required surface impedances for a certain user-defined chiral functionality at two frequencies and (2) their physical realization at microwaves. The first milestone is achieved through a proposed synthesis method that combines a semi-analytical method and a nonlinear optimization technique. In particular, the impedances are computed such that the devised chiral metasurface is also impedance-matched to a terminating medium. The chiral metasurfaces are then physically realized at microwaves by cascading layers of rotated arrays of multiple concentric rectangular copper rings. We establis

SUBMITTER: Kim M 

PROVIDER: S-EPMC5823897 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature