Abstract

We calculated the spectrum of normal scalar waves in a planar waveguide with absolutely soft randomly rough boundaries. Our approach is beyond perturbation theories in the roughness heights and slopes and is based instead on the exact boundary scattering potential. The spectrum is proved to be a nearly real nonanalytic function of the dispersion ζ2 of the roughness heights (with square-root singularity) as ζ20. The opposite case of large boundary defects is summarized.

© 1998 Optical Society of America

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