A Numerical Reconstruction of the Permittivity Profile of a Stratified Dielectric Layer

We consider the problem of determining the permittivity profile of a dielectric stratified medium of finite thickness terminated by a perfect conductor. The input data are the propagation and normalization constants of the guided modes, together with the values of the complex reflection amplitude for a TE-polarized monochromatic plane wave at different angles of incidence. In contrast to previous studies, our method of calculation is based on simple numerical procedures and uses only a physically justifiable regularization, quite different from the more involved regularization procedures that have been used elsewhere. The role of the guided modes is elucidated.