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OPTICAL PHOTOINDUCED PHENOMENA AND HOLOGRAPHIC RECORDING IN AMORPHOUS As-Se THIN FILMS

M. S. Iovu1,* , V. G. Ciorba1, E. P. Colomeico1, M. A. Iovu1, A. M. Nastase1, A. Prisacari1, M. Popescu2, O. I. Shpotyuk3

Affiliation

  1. Center of Optoelectronics, Institute of Applied Physics, Academy of Sciences of Moldova, Str. Academiei 1, MD-2028 Chisinau, R. Moldova
  2. National Institute for Physics of Materials, Bucharest-Magurele, Romania
  3. Lviv Scientific Research Institute of Materials, Scientific Research Company “Carat”, 202 Stryjska Str., 79031 Lviv, Ukraine

Abstract

The effect of light-induced photodarkening in amorphous As100-xSex (x=40‚98) thin films for different thickness and film composition was investigated. It was established a strong dependence of the red shift of the absorption edge and refractive index under light irradiation on the film composition and thermal treatment. It was established that the more sensitive films to photodarkening and holographic recording correspond to non-stoichiometric compositions of As55Se45 and As60Se40 glasses. The experimental results are interpreted in terms of structural optical polymerization process, which includes the transformation of As4Se4 and Se2 structural units in homogenius AsSe3/2 network..

Keywords

Amorphous chalcogenide films, Optical absorbtion and photoinduced phenomena, Holography.

Submitted at: Aug. 22, 2005
Accepted at: Sept. 22, 2005

Citation

M. S. Iovu, V. G. Ciorba, E. P. Colomeico, M. A. Iovu, A. M. Nastase, A. Prisacari, M. Popescu, O. I. Shpotyuk, OPTICAL PHOTOINDUCED PHENOMENA AND HOLOGRAPHIC RECORDING IN AMORPHOUS As-Se THIN FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 5, pp. 2333-2339 (2005)