Optical properties of As-Se amorphous composites

Photostructural transformations in amorphous films of chalcogenide glasses (ChG) under light irradiation present scientific and practical interests. That is well known that the composition of ChG determines the kind of structural units and the mean coordination number. In the present work the amorphous films of the chalcogenide systems As 10-x Se x (x=40+98), As 40 Se 60 :Sn y (y=0+10.0 at.% Sn), as well as the composite film structures of As 40 Se 60 :Dy+PVP were studied. From the transmission spectra, the values of the refractive index under light irradiation and heat treatment were calculated. The more sensitive to light irradiation are the amorphous films of As 100-x Se x (x=40+50), which exhibit the biggest modifications of the refractive index (up to Δn/n=0.394). It was established that the composite materials based on polymers and amorphous materials are sensitive to light irradiation in the visible and near IR region.