Stimulated Surface Relief Erasing in Amorphous As-Se Layers: Thermal- and Light Induced Effects

Sandor Molnar, Roland Bohdan, Viktor Takats, Yuri Kaganovskii, Sandor Kokenyesi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Here the kinetics of erasing surface relief gratings (SRGs) in amorphous As20Se80 thin films are studied under various temperatures (in the range 298–408 K) and continuous-wave illumination by band gap light of various intensities (0–2.5 W cm−2) and polarizations. The SRGs with 3.5 and 15 μm periods and 300 nm amplitudes are recorded by two beam interference. By the measurements of erasing kinetics on the grating of two the different periods, the authors are able to separate contributions of viscous flow and photo-induced (PI) diffusion flow, which the authors consider as independent mechanisms of mass transfer. The authors detect that band gap light illumination does not change the viscosity of chalcogenide films. In contrast to previous results, the authors suggest that mass transport is accelerated by light due to contribution of PI diffusion flow, not by decrease of “pure” viscous flow. Contribution of PI diffusion flow, as well as anisotropy of mass transport under illumination by polarized light, drops with increasing temperature, whereas contribution of viscous flow grows with temperature. By separation of contributions of PI diffusion and viscous flow in mass transfer, the authors can determine PI diffusion coefficients and their temperature dependences.

Original languageEnglish
Article number1800589
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume215
Issue number24
DOIs
Publication statusPublished - Dec 19 2018

Keywords

  • amorphous chalcogenides
  • photo induced mass transport
  • surface relief gratings
  • thermal erasing
  • viscosity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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