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Stimulated relaxational transformations in amorphous chalcogenide films

V. M. KRYSHENIK1,* , V. P. IVANITSKY2, V. S. KOVTUNENKO3, M. Y. BARAN2

Affiliation

  1. Institute for Solid State Physics & Chemistry, Uzhgorod National University, Voloshyn Str. 54, 88000 Uzhgorod, Ukraine
  2. Technical Engineering Department, Uzhgorod National University, Kapitulna Str. 13, 88000 Uzhgorod, Ukraine
  3. Cherkasy University of Technology, Shevchenko Boulevard 460, 18006 Cherkasy, Ukraine

Abstract

Irreversible changes of refractive index of as-deposited AsxS1-x amorphous films in course of physical ageing is studied using a prism-coupling technique. These changes result from an initiating effect of an optical mode in the film waveguide. It is shown that amorphous chalcogenide films can undergo structural and “mechanical“ relaxational transformations triggered by sub-bandgap light irradiation. An approach based on floppy modes is proposed to understand the response and irreversible relaxation changes of structural, mechanical and optical properties of nanoinhomogeneous amorphous chalcogenides..

Keywords

As-S chalcogenide films, Photostructural changes, Structural transformations, Irreversible relaxation, Ageing, Optical properties, Mechanical stresses, Optical waveguides.

Submitted at: July 27, 2006
Accepted at: Sept. 13, 2006

Citation

V. M. KRYSHENIK, V. P. IVANITSKY, V. S. KOVTUNENKO, M. Y. BARAN, Stimulated relaxational transformations in amorphous chalcogenide films, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1806-1813 (2006)