CdSxSe1-x NANOCRYSTALLITES : NEW MATERIALS FOR NON LINEAR OPTICS

Nanocrystallites of CdSxSe1-x semiconductors in glasses have non-linear properties which are function of the exciton confinement due to their sizes. The determination of the diameter of these nanocrystallites, critical to improve the properties of the systems, is determined by Raman scattering close to the laser line : the Low Frequency Inelastic Scattering (LOFIS). Possibility to determine the size distribution by LOFIS is demonstrated and effects of thermal treatments on the sizes and the size distribution of is discussed.