Abstract
We report data on the dispersion of the index of refraction of silver-doped As33S67 thin films in the visible and near-infrared regions. The measured data is analysed on the basis of a single-effective-oscillator model proposed by Wemple and DiDomenico. The silver content dependence of the oscillator energy Eo seems to vary in proportion to optical gap Eg opt of the sample, whereas the dispersion energy or oscillator strength Ed increases with increasing silver content. This latter fact indicates that the effective coordination of the cation increases as silver is incorporated into the chalcogenide host matrix.