Propagation Characteristics of Guided Waves in a Metal-Clad Planar Waveguide with Rough Boundaries

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A metal-clad optical waveguide consists of a normal dielectric film sandwiched between two metallic layers with negative dielectric constants at optical frequencies. Metal-clad waveguides are of interest in the technology of integrated optics. Metallic layers have been made necessary by a number of applications such as using as electrodes for electro-optic or magneto-optic devices, and connecting the optical components to other circuits. It has been already recognized that in metal-clad waveguides a special class of guided waves, called surface plasmon waves, can be sustained in addition to common guided waves in conventional waveguide structures. These surface waves have field amplitudes with a maximum at the interfaces and exist only for TM polarization. The presence of the surface plasmon waves gives rise to a phenomenon that TE waves are attenuated much less than TM waves, and this largeTM-to-TE loss ratio has recently been used to produce a polarizer or mode analyzer for integrated optics circuits, Remaining important problem is to theoretically evaluate the effect of the roughness on the propagation losses of the guided modes for both TE- and TM-polarized waves when the boundaries of the metal-clad waveguide is considered as slightly rough. Generally speaking, the scattering from the rough boundaries will cause the mode coupling or conversion and result in a reduction of the extinction ratio of a metal-clad waveguide polarizer.
社団法人電子情報通信学会の論文
1997-08-13

Propagation Characteristics of Guided Waves in a Metal-Clad Planar Waveguide with Rough Boundaries

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