Abstract

Random wave fields on the surface of a random rough metallic grating are investigated with the stochastic functional approach. For Bragg incidence the fields are expanded as the harmonics of the central spatial frequency of the grating with stochastic amplitudes that are numerically calculated by a discretized approximation that is valid for a wider spectrum than the one treated in a preceding paper [Ogura et al., Opt. Commun. 134, 1 (1997)]. It is demonstrated that the wave localization is caused by the random roughness of the surface rather than by the surface shape-dependent resonances.

© 1998 Optical Society of America

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