Abstract
Abstract : This report studies theoretically the refraction of a surface polariton as it propagates along the surface of a metal and strikes the edge of a thin dielectric film deposited on the metal. The reverse process is also considered in which a surface polariton propagating along the interface between a thin dielectric film and a metal substrate, or a guided-wave polariton in the film, runs off the end of the film onto the substrate. Transmission and reflection coefficients for the incident surface polariton or for the incident guide-wave polariton are calculated in each case, as well as the efficiency of exciting guided wave polaritons in the film and the radiation pattern in the vacuum above this structure of the bulk radiative modes excited at the film edge. The case in which the dielectric film is replaced by one made from the same metal as the substrate (a metallic step) is also studied for a small step heights. Additional keywords: numerical analysis; and Maxwells equations.
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