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dc.contributor.authorBenekou, Ven
dc.contributor.authorStrizik, Len
dc.contributor.authorWagner, Ten
dc.contributor.authorYannopoulos, SNen
dc.contributor.authorGreer, Alanen
dc.contributor.authorOrava, Jirien
dc.date.accessioned2018-01-23T14:24:57Z
dc.date.available2018-01-23T14:24:57Z
dc.date.issued2017-11-07en
dc.identifier.issn0021-8979
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/270997
dc.description.abstractTime-resolved Raman measurements reveal a three-stage mechanism of photostructural changes in Ge25.0Ga9.5Sb0.5S65.0 (containing 0.5 at.% of Er3+) glass under continuous-above-bandgap illumination. These changes are reversible and effectively athermal, in that the local temperature rises to about 60% of the glass-transition temperature and the phase transitions take place in the glass/crystal and not in an equilibrium liquid. In the early stages of illumination, the glassy-network dimensionality changes from predominantly 3-D to a mixture of 2-D/1-D represented by an increase in the fraction of edge-sharing tetrahedra and the emergence of homonuclear (semi)metallic bonds. This incubation period of the structural rearrangements, weakly thermally activated with an energy of ~0.16 eV, facilitates reversible photocrystallization. The photocrystallization rate in the glass is comparable to that achieved by thermal crystallization from supercooled liquid at large supercooling. Almost complete re-amorphization can be achieved in about an hour by reducing the incident laser-power density by a factor of ten. Glass-ceramic composites – with varying glass-to-crystal fraction – can be obtained by ceasing illumination during re-amorphization. Microstructural imaging reveals photoinduced mass transport and formation of columnar-porous structures. This shows the potential for bond-specific engineering of glassy structures for photonic applications with a spatial resolution unachievable by thermal annealing.
dc.publisherAIP
dc.titleIn-situ study of athermal reversible photocrystallization in a chalcogenide glassen
dc.typeArticle
prism.issueIdentifier17en
prism.publicationDate2017en
prism.publicationNameJournal of Applied Physicsen
prism.volume122en
dc.identifier.doi10.17863/CAM.17953
dcterms.dateAccepted2017-10-16en
rioxxterms.versionofrecord10.1063/1.5003575en
rioxxterms.versionAM*
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-11-07en
dc.contributor.orcidGreer, Alan [0000-0001-7360-5439]
dc.contributor.orcidOrava, Jiri [0000-0002-4036-5069]
dc.identifier.eissn1089-7550
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idTohoku University (unknown)
rioxxterms.freetoread.startdate2018-11-30


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