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The dependence of photosensitivity on composition for thin films of Ge x As y Se1axay chalcogenide glasses
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The dependence of photosensitivity on composition for thin films of Ge x As y Se1axay chalcogenide glasses
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Journal Article
The dependence of photosensitivity on composition for thin films of Ge x As y Se1axay chalcogenide glasses
2013
Overview
We have prepared twelve GeaAsaSe chalcogenide glass films with different chemical compositions and investigated their stability to exposure with near bandedge light. The evolution of two key parameters, the refractive index at 1550 nm and the bandgap with increasing fluence were fitted with stretched-exponential functions. While most of the films showed photo-bleaching (or photodarkening) behavior, we found that for films with a mean coordination number (MCN) around a2.45a2.50, neither the bandgap nor the refractive index changed upon irradiation, demonstrating that photostable glasses exist with a particular chemical composition corresponding to the strongest glass formers. Such photostable glasses are the best choice for applications in photonics.
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