Graphene-based Tunable Dual-Band Absorbers by Ribbon/Disk Array

TL;DR

This paper introduces simple graphene-based dual-band absorbers operating in the THz range, utilizing patterned arrays and impedance matching to achieve perfect absorption at two frequencies.

Contribution

It proposes a novel, simple structure for dual-band THz absorbers using graphene arrays, differing from complex multi-resonator designs.

Findings

Achieves dual-band absorption with a single element array

Uses impedance matching and graphene properties for resonance control

Demonstrates perfect absorption at two distinct THz frequencies

Abstract

This article presents two dual-band absorbers based on graphene one dimensional (1D) / two dimensional (2D) patterned arrays in the THz frequencies. In comparison to the previous work, the structure of the proposed device is very simple. Most dual-band absorbers are based on mixing resonances of resonators with different sizes inside the structure. In this paper, the proposed absorber is based on the arrays of one element. Dual capacitive-inductive nature of the graphene patterned array and the impedance matching condition are used to achieve two resonance bands with perfect absorption by adjusting the graphene properties.