Nonlinear harmonic interaction in a waveguide with periodic layered walls

Abstract

UDC 539.21We study the harmonic interaction in the nonlinear guiding layer located between two periodic layered structures. Analytical relations for the first-and second-harmonic amplitudes are obtained. It is shown that the nonlinear interaction coefficients become maximum at points where the Bragg resonance conditions are fulfilled for all structure layers of the studied waveguide including the guiding layer. The appreciable enhancement of the nonlinear interaction within the forbidden band described in experimental paper [1] is explained.