Scattering of second-harmonic light from small spherical particles ordered in a crystalline lattice
نویسندگان
چکیده
Experimental evidence of scattering of second-harmonic light from the surface of spherical particles of optical dimensions is presented. This mechanism for second-harmonic generation is observed in a suspension of monodisperse spherical colloidal particles, ordered in a centrosymmetric crystalline lattice. In this periodic structure the mechanism of phase matching is provided by the bending of the photon dispersion curve near the Bragg reflection band. A simple theoretical analysis based on the Rayleigh-Gans scattering approximation shows that constructive interference of the second-harmonic light scattered from different portions of a singlesphere surface leads to a nonvanishing field with a quadrupolar distribution intensity pattern. @S1050-2947~97!06506-2#
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