Abstract
We have analyzed the optical properties of a- Ge 30 - x Sb x S 70 chalcogenide glass films ( x = 0 , 10 , 20 and 30 at%); the chalcogenide films were prepared by vacuum thermal evaporation. The optical-absorption data indicate that the absorption mechanism is non-direct transition. We found that the optical band gap, E opt , decreases from 2.04 ± 0.01 to 1.74 ± 0.01 eV, whereas the refractive index increases with increasing Sb content. Data are analyzed by the Wemple equation, which is based on the single-oscillator model.
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