Terahertz Range Polarization Discrimination Using Microsize Graphene Strip-on-Substrate Grating

We study the discrimination between the orthogonally polarized plane waves with the aid of the graphene strip grating on dielectric substrate. Our numerical analysis uses the previously validated meshless full-wave codes based on the method of analytical regularization that possess mathematical convergence. The study reveals two regimes of high polarization selectivity. The first is the classical quasi-static Hertz effect due to the high/low reflection of the low-frequency E/H-polarized plane wave from the sparse well-conducting wire grating. The second is the inverse effect, based on the high reflection of the H-wave at the graphene strip plasmon-mode frequency that is tunable with DC bias. However, the latter regime can be spoiled if it hits an ultrahigh-Q lattice-mode resonance. If all the dimensions are on the microsize scale, then the resonances at the THz frequencies. This study is expected to help in the optimization of polarizer designs.