Pixel-based metaatom design of graphene-metasurface absorber for terahertz waves

Abstract

A pixel-based approach to design of metaatoms was implemented on graphene absorbers of terahertz radiation. The top surface of each metaatom was conceived as a square array of square pixels, some patched with graphene but not the others. This patterned graphene was separated from a continuous layer of graphene by an insulator, the entire assembly on top of a metal-backed dielectric substrate. When the chemical potential of graphene was taken to be sufficiently high, simulations indicate almost perfect peak absorptance can be obtained with a significant reduction in the need for graphene, depending upon the arrangement of the graphene pixels. © 2019 SPIE.