Propagation properties of a multilayer optical waveguide with an attenuating sheet.

A complex multilayer guide composed by a dielectric layer with a thin weakly attenuating sheet, embedded in a dielectric medium, has been theoretically investigated, treating also the limiting case in which the inner dielectric slab is absent. Computations for two typical cases of strong guiding are presented and discussed, from which appear the potentialities of the structure in mode selective guiding and modulation.