Optical properties of AsSe1.5−xTex glassy system

摘要: Abstract Thin AsSe1.5−xTex films with 0⩽x (∼300 K ) . The optical constants, the refractive index, n, and absorption k, of were determined for investigated compositions different thickness values (100– 300 nm using spectrophotometric measurements transmittance, T, reflectance, R, at normal incidence in spectral range 400– 2500 obtained both n k found to be independent film within above mentioned range. estimated indirect direct energy gap decreased as tellurium content increased parent sample AsSe1.5. dispersion energy, Ed, lattice dielectric constant, eL, system have been correlated type amount chemical bonds relative proportion constituent elements examined compositions.