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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/34753
Title: 
Light-induced relief gratings and a mechanism of metastable light-induced expansion in chalcogenide glasses
Author(s): 
Institution: 
  • Universidade de São Paulo (USP)
  • Univ Nottingham
  • Universidade Estadual Paulista (UNESP)
  • Acad Sci Czech Republ
  • ICT
ISSN: 
0163-1829
Abstract: 
We report on a metastable light-induced volume expansion in Ge25+xGa10-xS65 glasses under irradiation with band gap (UV) light, which can result in recording of relief gratings on their surface in the case of irradiation with two interfering beams. We propose a mechanism for the expansion, which is based on the light-induced change in the polarizability of secondary (van der Waals type) bonds and the effect of this change on primary (covalent type) bonds of the glass. The effect is suggested to be due to an interference of electrons, which belong to a chalcogen atom and participate in the formation of secondary and primary bonds, respectively. We suggest that a minimum point of the Lennard-Jones potential, which corresponds to the equilibrium position of a chalcogen atom is shifted in the course of irradiation to a larger interatomic distance. This shift causes a volume expansion and allows a diffusion of chalcogen atoms into the irradiated area. We show that light-induced polymerization of the glass network is an important attribute of the light-induced volume expansion.
Issue Date: 
1-Jun-2001
Citation: 
Physical Review B. College Pk: American Physical Soc, v. 63, n. 22, 5 p., 2001.
Time Duration: 
5
Publisher: 
American Physical Soc
Source: 
http://dx.doi.org/10.1103/PhysRevB.63.224203
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/34753
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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