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 7 (2005) 2333–2339

The effect of light-induced photodarkening in amorphous As_100-xSe_x (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.

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Cited Articles

1. Ohlídal I., Franta D., Frumar M., Jedelský J., Omasta J.,
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   Chalcogenide Letters 1 (2004) 1–10