To Study the linear and nonlinear optical properties of Se-Te-Bi-Sn/PVP (Polyvinylpyrrolidone) nanocomposites

摘要

The present work reveals the optical study of Se82Te_(15)Bi_(1.0)Sn_(2.0)/polyvinylpyrrolidone (PVP) nanocomposites. Bulk glasses of chalcogenide was prepared by well-known melt quenching technique. Wet chemical technique is proposed for making the composite of Se82TeisBi_(1.0)Sn_(2.0) and PVP polymer as it is easy to handle and cost effective. The composites films were made on glass slide from the solution of Se-Te-Bi-Sn and PVP polymer using spin coating technique. The transmission as well as absorbance is recorded by using UV-Vis-NIR spectrophotometer in the spectral range 350-700 nm. The linear refractive index (n) of polymer nanocomposites are calculated by Swanepoel approach. The linear refractive index (n) PVP doped Se_(82)Te_(15)Bi_(1.0)Sn_(2.0) chalcogenide is found to be 1.7. The optical band gap has been evaluated by means of Tauc extrapolation method. Tichy and Ticha model was utilized for the characterization of nonlinear refractive index (n_2).