Section 13. Chalcogenide
Photoinduced phenomena in As2S3 glass under sub-bandgap excitation

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Abstract

As2S3 glass shows reversible changes when illuminated with sub-bandgap light in which the photon energy is located in the Urbach-tail region. The photoinduced structural and optical changes appear to be similar to those induced by bandgap illumination. This similarity implies that localized electronic excitation is responsible for triggering atomic transformations. The sub-bandgap phenomena are promising for novel optical components, since the changes appear as volume effects.

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