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In situ measurements of photoexpansion in A s 2 S 3 bulk glass by atomic force microscopy

2019; Elsevier BV; Volume: 94; Linguagem: Inglês

10.1016/j.optmat.2019.05.016

1873-1252

Thiago V. Moreno, Vitor Santaella Zanuto, Nelson G. C. Astrath, Givanildo R. Silva, E. J. S. Fonseca, Samuel T. Souza, Donghui Zhao, Himanshu Jain, L. C. Malacarne,

Metallic Glasses and Amorphous Alloys

Photoinduced expansion is a special property of chalcogenide glasses, which makes them useful for various applications in photonics. A clear understanding of the kinetics and the topography of photoinduced effects is fundamental to improve potential applications. A detailed study on bulk glass is performed using in situ Atomic Force Microscope measurements. The corresponding expected thermal contribution is obtained by numerical simulation using Finite Elemental Analysis method. The results show a significant difference between the dynamics of metastable/permanent and transitory effects, with the permanent photoexpansion being much larger in magnitude and slower in kinetics than the transient or reversible changes. The former effect is of athermal origin. However, the dynamic response of the latter is similar to that expected from thermoelastic expansion, suggesting a close correlation between the two effects, which remains to be established.