Advertisement

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
Article

Abstract

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.

Keywords

Probe Beam Pump Beam Thermal Relaxation As2Se3 Pump Light 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We thank George Belev for help with sample preparation. This work was funded by NSERC Canada.

References

  1. 1.
    V.G. Zhdanov, V.K. Malinovskii, Sov. Tech. Phys. Lett. 3, 943 (1977)Google Scholar
  2. 2.
    V.G. Zhdanov, B.T. Kolomiets, V.M. Lyubin, V.K. Malinovskii, Phys. Status Solidi A 52, 621 (1979)CrossRefGoogle Scholar
  3. 3.
    K. Tanaka, ch. 4 in Handbook of Advanced Electronics and Photonic Materials and Devices, vol. 5, ed. by H.S. Nalwa (Academic Press, 2001)Google Scholar
  4. 4.
    V.M. Lyubin, M.L. Klebanov, ch. 6 in Photo-Induced Metastability in Amorphous Semiconductors, ed. by A.V. Kolobov (Wiley-VCH Verlag & Co., 2003)Google Scholar
  5. 5.
    H. Fritzsche, Phys. Rev. B 52, 15854 (1995)CrossRefGoogle Scholar
  6. 6.
    V.K. Tikhomirov, G.J. Adriaenssens, Phys. Rev. B 55, R660 (1997)CrossRefGoogle Scholar
  7. 7.
    P. Hertogen, Ph.D. thesis (Katholie University Leuven, 2000)Google Scholar
  8. 8.
    P. Hertogen, G.J. Adriaenssens, J. Non-Cryst. Solids 266, 948 (2000)CrossRefGoogle Scholar
  9. 9.
    P. Hertogen, V.K. Tikhomirov, G.J. Adriaenssens, J. Non-Cryst. Solids 256–257, 343 (1999)CrossRefGoogle Scholar
  10. 10.
    G. Pfister, A.R. Melnyk, M.E. Scharfe, Solid State Comm. 21, 907 (1977)CrossRefGoogle Scholar

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

Personalised recommendations