Stokes reciprocity equations and density of modes for absorbing stratified media

摘要

One considers the influence of absorption on Stokes reciprocity equations and on the density of modes (DOM) for stratified media. The reciprocity equations are extended to absorbing media by using the transfer matrix formalism and introducing a special complex conjugation. A method of calculation for the DOM is presented in the Wigner-time approach and applied to periodic and quasi-periodic absorbing stratified structures. Examples of the role of absorption are given in the soft-X-ray domain.