Riv.Mat.Univ.Parma (6) 2 (1999)


Electromagnetic waves in stratified media

Pages: 77-92
Received: 7 April 1999   
Mathematics Subject Classification: 78A40 - 78A25

Abstract: Time-harmonic wave propagation is considered in inhomogeneous, isotropic, electromagnetic solids. The particular case is then assumed that the material properties (permittivity and permeability) depend on a Cartesian coordinate only and the problem is shown to satisfy a system of linear, first-order, ordinary differential equations. A suitable change of unknown functions is performed by means of the eigenvectors of the coefficient matrix. The peculiar structure of the system of evolution equations results in a single equation for a suitable unknown variable thus providing finer approximations to the solution of a Cauchy problem with data at a surface. The recourse to properties of thermodynamic character allows a deeper understanding of the results. The coefficients of reflection and transmission are evaluated in closed form. As a check of consistency, in the thin-layer limit for a stratified slab, Fresnelís formulae for reflection and transmission are recovered.

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