The potential of graphene metamaterials is becoming increasingly evident as graphene-related technologies continue to progress. This paper proposes a terahertz metamaterial absorber using graphene which is designed and simulated using CST software. The device features a four-layer structure: a gold base, followed by a silicon dioxide dielectric layer, then a patterned graphene layer, and finally a patterned gold layer on top. The absorber demonstrates two near-perfect absorption peaks within the terahertz spectrum, at 0.622 THz and 0.895 THz, with peak absorption rates of 99.23 % and 99.93 %, respectively. Furthermore, tunability was obtained by altering the graphene Fermi energy, which led to a shift in the absorption peak frequencies. The study also explores the impact of the graphene relaxation time on the absorptivity. The most important characteristic of the proposed design is that it exhibits robust, polarization-independent performance and also sustaining stable absorption levels even at wide incidence angles of up to 75°. It also offers a high refractive index sensitivity of 0.131 THz/RIU and 0.156 THz/RIU, at 0.622 THz and 0.895 THz, respectively. The proposed design combines the advantages of high absorption, effective frequency tuning ability and dual absorption peaks, shows promise for application areas in the domains of sensing and imaging technologies.
Behera et al. (Fri,) studied this question.