A Study on Absorptance Enhancement of Multilayer Graphene Metamaterial in Terahertz Regime

Abstract

In the present study, we analyze the absorptance enhancement of a multilayer fishnet shaped graphene metamaterial structure by optimizing its number of layers (N) and resonance cavity length (d). The study shows that, the absorptance (A) enhances with a rise in N, where the rate of enhancement decreases for higher N. Pinning N at a reasonable value (N = 10), more than 95 % of absorptance has been achieved through optimization of d to a higher value (d = 26 µm). Moreover, the optimized higher value of d causes the frequency of high absorption to stay close to the minimum absorptance. This makes the proposed metamaterial structure suitable towards sensing applications. The aforementioned outcomes of the proposed study can help to realize cost effective and efficient graphene metamaterial for THz absorption by avoiding the involvement of extra cost, fabrication complexity, and expense of external bias.