The kinetics of photo-induced dichroism in thin films of amorphous arsenic triselenide

  • Robert E. Johanson
  • Matthew Kowalyshen
  • Daniel DeForrest
  • K. Shimakawa
  • S. O. Kasap


We have measured the dichroism in amorphous As2Se3 films induced by a polarized pump beam of near bandgap light. The total induced dichroism saturates at a value that depends linearly on sample thickness—the relative change in the absorption coefficient is about 0.2%. We fit the time dependence of the induced dichroism to a stretched exponential function of the form exp(-(t/τ)β) and find that the time constant (τ) depends inversely on the pump-beam intensity and the stretching exponent (β) is in the range 0.5–0.6 depending on thickness but relatively independent of the intensity. A dc electric field had no effect on the induced dichroism. The addition of a small amount of iodine (0.1%) increased τ in some but not all samples.


Probe Beam Pump Beam Thermal Relaxation As2Se3 Pump Light 
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We thank George Belev for help with sample preparation. This work was funded by NSERC Canada.


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Robert E. Johanson
    • 1
  • Matthew Kowalyshen
    • 1
  • Daniel DeForrest
    • 1
  • K. Shimakawa
    • 2
  • S. O. Kasap
    • 1
  1. 1.Department of Electrical and Computer EngineeringUniversity of SaskatchewanSaskatoonCanada
  2. 2.Department of Electrical and Electronic EngineeringGifu UniversityGifuJapan

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