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The enhanced transmission effect, manifested as a narrow peak in the angular distribution of the intensity of diffuse scattered light in the antispecular direction, has been experimentally investigated when a p-polarized laser beam passes through a metal film deposited on a piece of glass substrate. This peak is an analogue of enhanced backscattering in the transmission of light through a randomly rough metal surface. A fully automatic bidirectional reflectometer was used to measure the enhanced transmission of gold and silver surfaces under illumination of He-Ne laser. The results are compared with a recent perturbation theory of the localization of surface polaritons.
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Zu-Han Gu, Richard Sam Dummer, Alexei A. Maradudin, Jun Q. Lu, Arthur R. McGurn, Eugenio R. Mendez, "Experimental study of enhanced transmission through rough metal surfaces," Proc. SPIE 1331, Stray Radiation in Optical Systems, (1 December 1990); https://doi.org/10.1117/12.22647