Analysis of optical waveguide structures combining cylindrical and planar structures by a simple perturbative method

Publisher Website
Google Scholar
Abstract
A simple perturbative method is proposed for the study of optical waveguide structures formed by a cylindrical fiber coupled to a planar substructure limited by an external medium with a refractive index below the fiber cladding level. The method is applied to the analysis of a structure including a thin metal layer deposited on the surfaceof a side-polished fiber. The comparison between theoretical and experimental results shows that the method provides an explanation and an accurate description of the resonant coupling between the fiber mode and a surface plamon wave in the metal film.