Coexistence of fast photodarkening and slow photobleaching in Ge19As21Se60 thin films

Khan, Pritam and Barik, AR. and Vinod, EM and Sangunni, KS and Jain, H and Adarsh, KV (2012) Coexistence of fast photodarkening and slow photobleaching in Ge19As21Se60 thin films. In: OPTICS EXPRESS, 20 (11). pp. 12416-12421.

PDF jou_optics_20-11_2012.pdf - Published Version Restricted to Registered users only Download (1MB) | Request a copy

Abstract

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. (C) 2012 Optical Society of America

Item Type:	Journal Article
Publication:	OPTICS EXPRESS
Publisher:	OPTICAL SOC AMER
Additional Information:	Copyright for this article belongs to The Optical Society
Keywords:	AMORPHOUS CHALCOGENIDES;GLASSES;PULSES
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	26 Jun 2012 10:28
Last Modified:	26 Jun 2012 10:28
URI:	http://eprints.iisc.ac.in/id/eprint/44743

Actions (login required)

View Item