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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 11 — May. 21, 2012
  • pp: 12416–12421

Coexistence of fast photodarkening and slow photobleaching in Ge19As21Se60 thin films

Pritam Khan, A. R. Barik, E. M. Vinod, K. S. Sangunni, H. Jain, and K. V. Adarsh  »View Author Affiliations

Optics Express, Vol. 20, Issue 11, pp. 12416-12421 (2012)

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We experimentally demonstrate the coexistence of two opposite photo-effects, viz. fast photodarkening (PD) and slow photobleaching (PB) in Ge19As21Se60 thin films, when illuminated with a laser of wavelength 671 nm. PD appears to begin instantaneously upon light illumination and saturates in tens of seconds. By comparison, PB is a slower process that starts only after PD has saturated. Both PD and PB follow stretched exponetial dependence on time. Modeling of overall change as a linear sum of two contributions suggests that the changes in As and Ge parts of glass network respond to light effectively indepndent of each other.

© 2012 OSA

OCIS Codes
(160.2750) Materials : Glass and other amorphous materials
(310.6860) Thin films : Thin films, optical properties
(160.5335) Materials : Photosensitive materials

ToC Category:
Thin Films

Original Manuscript: April 18, 2012
Revised Manuscript: May 10, 2012
Manuscript Accepted: May 11, 2012
Published: May 16, 2012

Pritam Khan, A. R. Barik, E. M. Vinod, K. S. Sangunni, H. Jain, and K. V. Adarsh, "Coexistence of fast photodarkening and slow photobleaching in Ge19As21Se60 thin films," Opt. Express 20, 12416-12421 (2012)

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