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Fast and reversible excited state absorption in II-VI-based nanocomposite thin films

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Title Fast and reversible excited state absorption in II-VI-based nanocomposite thin films
 
Creator VASA, P
AYYUB, P
SINGH, BP
 
Subject semiconductor-doped glasses
nanocrystals
 
Description Nanocomposite CdS-ZnO thin films deposited directly on quartz substrates by high-pressure magnetron sputtering show a completely reversible photodarkening at a very low threshold intensity (similar to 1 kWcm(-2)), and a moderately fast recovery time (< 1 ms). This makes them ideal in optical limiting applications for both continuous wave as well as high rep-rate pulsed lasers. The same system also shows an intensity-dependent quenching of the photoluminescence. Using a pump-probe experiment, we show that photodarkening in such a quantum-dot thin film originates from excited state absorption. (c) 2005
 
Publisher AMER INST PHYSICS
 
Date 2011-07-15T17:40:12Z
2011-12-26T12:49:36Z
2011-12-27T05:34:57Z
2011-07-15T17:40:12Z
2011-12-26T12:49:36Z
2011-12-27T05:34:57Z
2005
 
Type Article
 
Identifier APPLIED PHYSICS LETTERS, 87(6), -
0003-6951
http://dx.doi.org/10.1063/1.2007871
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4337
http://hdl.handle.net/10054/4337
 
Language en