The scattering of light from a slightly rough surface overlying a reflecting surface is investigated. It is shown that the long-scale component of the roughness spectrum plays a critical role in the scattering patterns obtained. The scattered interference patterns are critically dependent on small variation of the rms height of the long-scale component of the roughness. Conventional perturbation theory is found to be invalid in cases in which interference phenomena in the scattering are of importance. A model is proposed that quantitatively describes the measured angular intensity distributions.
© 1998 Optical Society of America
Yu.S. Kaganovskii, V. D. Freilikher, E. Kanzieper, Y. Nafcha, and M. Rosenbluh, "Interference in light scattering from slightly rough dielectric layers," Opt. Lett. 23, 316-318 (1998)