NANOCRYSTALS OF CDS DISPERSED IN A SOL-GEL SILICA GLASS - OPTICAL-PROPERTIES

Nanocrystallites of CdS of constant mean radius are embedded in variou s concentrations (up to 29%) in pure silica glass obtained by a sol-ge l technique. Doped glass samples as well as thin glass layers deposite d on microscope slides are prepared and structurally characterized by electron microscopy. The linear optical properties (absorption coeffic ient and index of refraction) of these CdS-doped glasses are measured as functions of the CdS volume fraction in the samples, Their third or der nonlinear optical susceptibility is also determined by degenerate four-wave mixing experiments near resonance. The values obtained for s amples with different CdS volume fraction are compared to those of bul k CdS platelets.