Polarization-Insensitive, Wideband Terahertz Absorber Comprised of Fan-like Metasurface

Abstract

In this manuscript, we studied a wideband metasurface-based terahertz (THz) absorber. The metasurface of the proposed absorber was comprised of fan-like periodic resonators made of nickel (Ni). The absorptivity of the proposed absorber was analyzed from 3.5 to 5 THz. The wideband absorptivity is observed with an absorption above 75% from 3.7 to 4.7 THz. The polarization-insensitive behavior of the absorber is depicted due to the symmetric nature of the top metasurface. The absorption feature was also analyzed for the transverse electric (TE) and transverse magnetic (TM) operating modes for the obliquity of the incidence wave. The surface current density shows that absorption is achieved due to the electric resonance of the proposed absorber. The proposed absorber would be useful for several applied areas covering medical science, communication, safety supervision, chemical sensing, and imaging.