Recently there has been an enormous interest in film nanostructuies composed of nano-sized crystals and/or local regions of colour centres (CC), because they possess strong optical nonlinearity and/or luminescence, a great potential for miniature modulators, light-emitting sources, dosimeters. Among these film nanostmctures, a class of nanolayer-by-nanolayer nanostructured films is one of the most attractive thin film structures These structures composed of semiconductor A2B6 nanociystals (NC) exhibit large, ultrafast third-order optical nonlinearity at visible wavelengths as well the periodic structures formed of irradiated dielectric NCs have efficient luminescent CCs, Extra feature of NC composed film structures in comparison with bulks is the big relation of NC surface area to their volume , which is in inverse proportion to their linear size. Various film nanostructures had been extensively investigated , but determination of the correlations between their distinctive properties and their microstructure (size, ordering, arranging, developed intrinsic surface of NCs) have not been completed
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