The dependence of photosensitivity on composition for thin films of Ge x As y Se1-x-y chalcogenide glasses

Xueqiong Su; Rongping Wang; Barry Luther-Davies; Li Wang

doi:10.1007/s00339-013-7585-7

The dependence of photosensitivity on composition for thin films of Ge _x As _y Se_1-x-y chalcogenide glasses

Xueqiong Su, Rongping Wang^*, Barry Luther-Davies, Li Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

62 Citations (Scopus)

Abstract

We have prepared twelve Ge-As-Se 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 ≈2.45-2.50, 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.

Original language	English
Pages (from-to)	575-581
Number of pages	7
Journal	Applied Physics A: Materials Science and Processing
Volume	113
Issue number	3
DOIs	https://doi.org/10.1007/s00339-013-7585-7
Publication status	Published - Nov 2013

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abstract = "We have prepared twelve Ge-As-Se 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 ≈2.45-2.50, 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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The dependence of photosensitivity on composition for thin films of Ge _x As _y Se_1-x-y chalcogenide glasses

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