Reconfigurable Terahertz Polarizers and Absorbers Based on Graphene Metasurfaces

Numerical techniques for modeling of THz devices based on graphene metasurfaces are developed by using rigorous mathematical models to solve the Maxwell's equations with electrodynamic boundary conditions simultaneously with a model of the graphene surface conductivity determined from the Kubo formula. The transmission coefficients of THz polarizers, based on the metasurfaces of rectangular graphene nanoribbons, depending on the frequency and angle of incidence for different values of the chemical potential were calculated for the THz frequency range. It is shown that 2D periodic arrays of graphene rectangular ribbons on the multilayer substrates containing the dielectric and graphene layers are electrically controlled absorbers at the surface plasmon-polariton resonance frequencies absorbing almost 100% of the energy incident on them in a wide range of THz frequencies.