Microwave Absorption due to the Geometric Resonance of the LSE Surface Wave in a Wave Guide

Abstract

Microwave absorption due to the longitudinal-section electric (LSE) modes is considered for a semiconductor-slab loaded in a wave guide. The absorption gets maximum when the fundamental LSE surface-wave is strongly excited and resonates geometrically inside the slab. The conditions for occurrence of the strong absorption depend remarkably on frequency and the size of the slab, but are adjustable by variation of magnetic field value and carrier densities. These absorptions explain quite well the results observed near cyclotron resonance fields for Ge-slabs by Otsuka et al.