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

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.