Photoexpansion in As 2 S 3 glass
1998; American Physical Society; Volume: 57; Issue: 9 Linguagem: Inglês
10.1103/physrevb.57.5163
ISSN1095-3795
Autores Tópico(s)Nonlinear Optical Materials Studies
ResumoMechanisms of photoexpansion in chalcogenide glasses have been studied in three respects. A detailed x-ray investigation of ${\mathrm{As}}_{2}{\mathrm{S}}_{3}$ shows that the photoexpansion can be connected with asymmetric broadening of the first sharp diffraction peak. Comparison between radiation-induced volume changes and density ratios of glassy-to-crystalline forms in ${\mathrm{As}}_{2}{\mathrm{S}}_{3}$ and ${\mathrm{SiO}}_{2}$ implies that ${\mathrm{As}}_{2}{\mathrm{S}}_{3}$ can expand since the glass is as dense as its crystal. When ${\mathrm{As}}_{2}{\mathrm{S}}_{3}$ is exposed to illumination, the photoexpansion appears earlier and later than the photodarkening for bandgap and subbandgap illumination, respectively. These observations are discussed from a microscopic point of view.
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