Abstract

We attempt to explain Hillebrecht’s data, as reported by Raether [ H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings ( Springer-Verlag, Berlin, 1988), pp. 74– 81], for normal-incidence light scattering off Ag surfaces with small roughness. We use a two-scale-roughness tilt model consisting of a homogeneous, isotropic overlayer of varying thickness on a wavy surface. This model predicts that, for normal incidence, the angular dependence of cross-polarized scattering from Ag is approximately the same for the sp and ps components. Such a behavior is seen in Hillebrecht’s data, except at large scattering angles, and is not reproduced by earlier theories. To obtain the experimental sp/ps ratio of approximately 0.5, we must assume that the dielectric constant of the overlayer is approximately two thirds of the bulk value, accounting for surface effects.

© 1994 Optical Society of America

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