Surface grating formation and erasing on a-Se films |
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Authors: | V Palyok IA Szabó DL Beke A Kikineshi |
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Institution: | (1) Department of Solid State Electronics, Uzhgorod State University, Pindhirna St. 46, Uzhgorod 88000, Ukraine, UA;(2) Department of Solid State Physics, Debrecen University, 4010, Debrecen, P.O. Box 2, Hungary, HU |
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Abstract: | Surface relief formation at holographic recording on amorphous selenium films was demonstrated and investigated. The presence
of this optical phase modulation component is essential for ensuring significant, stable and erasable optical recording in
a-Se films at 290–320 K temperatures, where conventional photodarkening was known as insignificant and unstable. Photocrystallization
can only be observed in super-exposed a-Se films at the given experimental conditions of hologram recording. Erasing behavior
of surface relief gratings under heat treatment was also investigated in order to reveal further details of the mechanism.
Photoinduced structural transformations within the amorphous phase, connected to local ordering under the condition of light-induced
fluidity, are proposed as an explanation for the relief formation and erasing. The observed reversible optical recording process
may be useful for the various optoelectronic applications of photoconductive a-Se layers.
Received: 12 June 2000 / Accepted: 6 June 2001 / Published online: 30 August 2001 |
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Keywords: | PACS: 42 70 Ln 42 40 Ht 81 05 Gc |
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