Fine structure in the khgr;(2)signals of inorganichyphen;organic nanocomposites

摘要

Thin films of organically modified ceramics with nonlinearhyphen;opticalhyphen;active chromophores produced in a solhyphen;gel process exhibit Maker fringe signals which are superimposed by a periodic fine structure. The fine structure is shown to be due to Fabryndash;Perot resonances of the secondhyphen;harmonic light which are stronger as compared to the amplitude corresponding to the regular Fresnel surface reflectivity by one to two orders of magnitude. The effect which is also observed on unpoled samples is tentatively ascribed to an accumulation and partial spontaneous orientation of the chromophores at the film surfaces.