Kinetics of optical reorientation in amorphous GeSe2 films

T. Kosa, I. Jánossy

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Reorientation cycles of photo-induced anisotropy in an amorphous chalcogenide film have been investigated. The kinetics of the reorientation process show a simple power-law time dependence on short time scale. A model based on bistable defect centres with widely distributed relaxation times is proposed. It is speculated that excitations from or to the band tails might be involved in the reorientation process. Finally the influence of circularly polarized light on the induced anisotropy is discussed. An interesting 'back-shoot' effect is shown which gives further support to the proposed wide distribution of relaxation times.

Original languageEnglish
Pages (from-to)355-366
Number of pages12
JournalPhilosophical Magazine B: Physics of Condensed Matter; Electronic, Optical and Magnetic Properties
Volume64
Issue number3
Publication statusPublished - Sep 1991

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Amorphous films
Relaxation time
Anisotropy
Kinetics
Light polarization
Defects

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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AB - Reorientation cycles of photo-induced anisotropy in an amorphous chalcogenide film have been investigated. The kinetics of the reorientation process show a simple power-law time dependence on short time scale. A model based on bistable defect centres with widely distributed relaxation times is proposed. It is speculated that excitations from or to the band tails might be involved in the reorientation process. Finally the influence of circularly polarized light on the induced anisotropy is discussed. An interesting 'back-shoot' effect is shown which gives further support to the proposed wide distribution of relaxation times.

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