Theoretical comparison of scattering losses in planar waveguides with wall roughness and core inhomogeneity

J. Merle Elson

doi:10.1117/12.453787

22 October 2002 Theoretical comparison of scattering losses in planar waveguides with wall roughness and core inhomogeneity

J. Merle Elson

Author Affiliations +

Proceedings Volume 4780, Surface Scattering and Diffraction for Advanced Metrology II; (2002) https://doi.org/10.1117/12.453787
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Scattering losses of guided waves that propagate in a planar waveguide are considered. Sources of scattering include random roughness at the cladding-core boundaries and random inhomogeneity of the waveguide core permittivity. A finite length segment of the waveguide channel has either random wall roughness or material inhomogeneity. The roughness is 1-D and the core inhomogeneity is 2-D and both are numerically generated to have a Gaussian autocorrelation. The length of the scattering segment (roughness or inhomogeneity) is varied from 0 to 160λ. Maxwell's equations in 2-D are solved in the frequency domain for both TE and TM polarization using modal expansion methods. Obtaining numerical solutions is facilitated by using perfectly matched boundary layers and the R-matrix algorithm. The guided waves are excited by a Gaussian beam incident on the waveguide aperture. For various parameters, numerical results are given for waveguide power loss per unit length of the imperfect waveguide segment.

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J. Merle Elson "Theoretical comparison of scattering losses in planar waveguides with wall roughness and core inhomogeneity", Proc. SPIE 4780, Surface Scattering and Diffraction for Advanced Metrology II, (22 October 2002); https://doi.org/10.1117/12.453787

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