A modal solution for reflection and transmission at a Chiral-Chiral interface

A harmonic Green's function solution for a magnetic line source above and below a flat interface between two chiral materials is derived. The solution is expressed in terms of the characteristic right and left circularly polarized waves. The harmonic Green's function formulation is converted into a modal representation. The modal representation is suitable for the complete expansion of the electromagnetic fields above and below a rough interface between two chiral materials with laterally varying material properties. The modal expansion is written in terms of orthogonal-basis and reciprocal-basis functions, which have been used to formulate generalized Fourier transforms and derive the generalized telegraphists' equations for electromagnetic fields in irregular chiral media.