Structure and imaging properties of As40S60−xSex glasses

Compositional dependence of photo- and thermally induced structural changes in As40S60−xSex layers (x=0,20,30,40,60) have been measured. Dispersion of the refractive index was obtained from the transmission data. Single-oscillator model parameters (oscillator energy, dispersion energy) were estimated. The evolution of the optical dielectric constant was analyzed using the Penn model. Raman measurements have shown that two-phase structures characteristic of glasses are preserved in As40S60−xSex layers and indicate different bonding structures for as-evaporated, exposed, and annealed layers. These correspond to photo- and thermally induced changes. The single-oscillator energy changes linearly with composition. The compositional dependencies of such structurally determined parameters as glass transition temperature, relaxation enthalpy, specific heat capacity and dispersion energy are explained by a small deviation from the statistical effects of substitution of Se atoms by S in the composition change.