Gyrotropic Effect on Surface Polariton Propagation

Abstract

Surface polariton propagation between a gyrotropic medium with arbitrary magnetization direction and an isotropic medium is investigated. Assuming that both the permittivity and the permeability of the gyrotropic medium are anisotropic, the dispersion relation equation for the surface polaritons is derived, which is applied to specific configurations of the propagation direction of the surface polaritons, the magnetization and the interface. When the gyrotropic effect is sufficiently weak, which means that the permittivity and the permeability of the gyrotropic medium are nearly isotropic, the influence of the magnetization direction on the propagation characteristics of the surface polaritons, such as the emergence of nonreciprocity, is investigated in detail.