Wide-angle and simultaneously wideband blazing (deflection) enabling multifunctionality in metagratings comprising epsilon-near-zero materials

SEREBRYANNIKOV, ANDRIY E.; SKIGIN, DIANA C.; HODJAT HAJIAN; OZBAY, EKMEL

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS

OPTICAL SOC AMER

Lugar: Washington; Año: 2023

0740-3224

In this paper, diffraction on gratings made of a dispersive material in epsilon-near-zero (ENZ) regime and having one-side corrugations and also two-component dielectric-ENZ gratings with inner corrugations and flat outer interfaces. The focus put on achieving wideband and simultaneously wide-angle -1st order blazing (anomalous reflection) may enable wideband spatial filtering and demultiplexing. Several typical scenarios are discussed, which differ in maximum magnitude and size of the blazing area observed on the frequency-incidence angle plane, as well as the contribution of the ranges of positive and negative permittivity in the vicinity of zero. High capability of ENZ and especially dielectric-ENZ gratings in asymmetric reflection is demonstrated for two level of losses in the dispersive material.