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dc.contributor.authorMessaddeq, S. H.
dc.contributor.authorTikhomirov, V. K.
dc.contributor.authorMessaddeq, Y. [UNESP]
dc.contributor.authorLezal, D.
dc.contributor.authorLi, M. Siu
dc.identifier.citationPhysical Review B - Condensed Matter and Materials Physics, v. 63, n. 22, p. 2242031-2242035, 2001.
dc.description.abstractWe 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.en
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physics
dc.titleLight-induced relief gratings and a mechanism of metastable light-induced expansion in chalcogenide glassesen
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversity of Nottingham
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionLaboratory of Inorganic Materials IIC ASCR and ICT
dc.description.affiliationInstituto de Física de São Carlos–Universidade de São Paulo, C.P. 369, CEP: 13560-970, São Carlos, SP
dc.description.affiliationMechanical Materials Manufacturing Engineering & Management University of Nottingham, Nottingham NG7 2RD
dc.description.affiliationInstituto de Química–UNESP–C.P. 355, CEP: 14801-970, Araraquara, SP
dc.description.affiliationLaboratory of Inorganic Materials IIC ASCR and ICT, Pelleova 24, Prague 6
dc.description.affiliationUnespInstituto de Química–UNESP–C.P. 355, CEP: 14801-970, Araraquara, SP
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