Theoretical study of plasma resonance absorption in conical diffraction

Surface-plasmon excitation on a corrugated Ag surface in conical (nonplanar) geometry is studied. Both p and s polarizations of the incident wave are considered. The Rayleigh method is applied to obtain the infinite set of simultaneous linear equations with respect to the reflected and transmitted amplitudes of the spatial harmonics. The truncated system is numerically solved to explain the experimental data of Inagaki et al. [ J. Opt. Soc. Am. B3, 992 ( 1986)]. Mode conversions, p to s and s to p, are fully taken into account. The optimal behavior of the minimal total reflectivity with respect to the corrugation amplitudes is studied for two azimuthal angles.