Parametric Variation for Absorption Optimization of Circular Ring Graphene Based Tunable Metamaterial Absorber

This paper proposes and validates an approach for the parametric variation of a circular ring-shaped graphene-based metamaterial perfect absorber. The parametric variation optimizes the absorption strength at the resonant frequency. The absorber is constructed with a graphene metasurface etched inside a polymer TOPAS with a gold ground plate placed at bottom that acts as a reflective surface. The proposed model is simulated on COMSOL Multiphysics. The simulation results showed that the optimized graphene-based perfect absorber through parametric variation is tunable for a broad frequency range of 2.5 Terahertz to 5.5 Terahertz, presents wide-angle absorption up to 60 degrees for both TM and TE incident wave, and is angle stable. Therefore, the parametric conditions presented in this paper can be used for designing circular ring graphene based perfect absorber for different ranges of operating frequencies.