Three-dimensional direct optical writing and Raman characterization of resulting structural changes in As2S3 glasses |
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| Authors: | V. K. Tikhomirov M. Barj S. Turrell |
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| Affiliation: | 1. Novel Photonic Glasses Research Group , Center for Advanced Materials, University of Nottingham , Nottingham NG7 2RD, UK;2. Laboratoire de Spectrochimie Infrarouge et Raman (LASIR) , CNRS, UMR 8516, CERLA – Centre d’Etudes et de Recherches Lasers et Applications, Université des Sciences et Technologies de Lille 1 , Bat. C-5, 59655 Villeneuve d’Ascq Cedex, France |
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| Abstract: | We report on optical writing of typically 300–1000?nm diameter dots within the volume of a bulk As2S3 chalcogenide glass using a focused 1–3?mW beam of a cw He–Ne laser. The Raman spectra taken from the dots in the course of the writing indicate that the photorefractivity is manifested by an increased polarizability of bonds within intrinsic As4S4 (realgar) groups as well as of S–S bonds within the matrix of the As2S3 glass. The photorefractivity is also accompanied by softening of the As–S–As vibrational frequencies, characteristic of AsS3 pyramids, which are the main structural units of the As2S3 glass. |
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