Graphene-based tunable dual-band polarization sensitive absorber for applications in the terahertz regime

Abstract This paper proposes a tunable dual-band polarization-sensitive absorber that displays two distinct absorptance peaks for two different polarized incident lights. The proposed absorber uses graphene as the material for the metasurface to utilize its tunable surface conductivity for achieving a tunable resonant frequency. The tunable absorber displayed two distinct absorption peaks for two separately polarized incident waves. For x -polarized incident light, the proposed absorber displayed perfect absorptance for a tunable bandwidth of 3 THz between 2.85 THz and 5.85 THz, and for y -polarized incident light, the proposed absorber displayed perfect absorptance for a tunable bandwidth of 1.5 THz between 11 THz and 12.5 THz. Numerical computations were performed with extremely fine mesh quality to study the absorptance spectrum of the proposed absorber for different Fermi energy levels, incident angles, and azimuthal angle of incidence. The proposed absorber displays appreciative characteristics which makes it a suitable candidate for energy harvesting, polarization detection, and polarization conversion of unpolarized light.