<title>Propagation of surface millimeter and submillimeter waves on the lateral surface of a ferrite/semiconductor superlattice</title>

Abstract

The purpose of this paper is investigation of propagation peculiarities of the surface electromagnetic waves (SEW) on the lateral surface of a superlattice (SL) that consists of alternating layers of ferrimagnet insulator and semiconductor. Most particular attention is payed to those collective surface modes which arise from the coupling between magnetoplasmons, magnons and fluctuating electromagnetic fields. Previous ivnestigations of mixed SEW in infrared region were made for a two layered sandwich structures antiferromagnet/semiconductor in the absence of external static magnetic field. Investigation of SEW on the lateral surface of SL in the presence of external magnetic field requires a generalization of the results for more general case of dielectric and magnetic permeability tensors in phenomenological theory of SL. The method of effective homogenous anisotropic medium is used in this work to find permeability tensors of the ferrite/semiconductor SL. This method can be used if the period of SL is less than the light wavelength. In the presence of an external static magnetic field each medium is described by a gyrotropic tensor. The effective medium description allows to express the dielectric and magnetic premeability tensors of the SL in terms of individual layers permeabilities. Using these tensors, the dispersion relation for SEW localized at the interface between lateral surface of the semi-infinite SL and an isotropic dielectric (or vacuum) are obtained. In the case of Voigt configuration some new resonance and cut-off frequencies are found.