Frequency and polarization selectivity of graphene strip gratings

We consider the scattering and absorption by infinite flat graphene strip gratings in a dielectric slab in the THz range. Both the H and E-polarization regimes are analyzed. Accurate numerical treatment is based on the use of singular integral equations and projection to orthogonal polynomials. The resulting numerical algorithm possesses guaranteed convergence and controlled accuracy of computations including the natural resonances. Reflectance, transmittance, and absorbance by the graphene-strip gratings are studied; surface-plasmon standing-wave resonances on strips are quantified in the H-polarization case. The potentialities of the polarization discrimination between the E-polarization and H-polarization cases are discussed.