Single/Multi-band graphene-based disk THz absorbers with single graphene layer: conceptual design
摘要
This article introduces a unified structure for broadband and multi-band graphene-based absorbers. The absorption process relies on multiple circular graphene disks positioned on a glass surface. The absorber’s functionality can be adjusted from broad-band to multi-band by varying its height. To thoroughly assess its performance, we employed two theoretical frameworks: the transmission line model (TLM) and the Finite Element Method (FEM). Additionally, we conducted optical analysis using various incident wave polarizations. To validate our findings, we simulated the structure in the CST Studio simulator. The analysis reveals that the structure achieves over 90% absorption in the broad-band phase. Furthermore, it exhibits five absorption peaks: 28.1%, 99.9%, 98.1%, 94%, and 76% at frequencies of 0.3, 1, 2, and 2.7 THz, respectively, in the multi-band absorption phase.