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29 March 2024
 
  » arxiv » cond-mat/0507667

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Excitonic nonlinear absorption in CdS nanocrystals studied using Z-scan technique
J. He ; W. Ji ; G. H. Ma ; S. H. Tang ; H. I. Elim ; W. X. Sun ; Z. H. Zhang ; W. S. Chin ;
Date 28 Jul 2005
Journal J. Appl. Phys. 95, 6381 (2004)
Subject Materials Science | cond-mat.mtrl-sci
AbstractIrradiance dependence of excitonic nonlinear absorption in Cadmium Sulfide (CdS) nanocrystals has been studied by using Z-scan method with nanosecond laser pulses. The wavelength dependence of nonlinear absorption has also been measured near the excitonic transition of 1S(e)-1S3/2(h). We observe the saturable absorption, which can be described by a third-order and a fifth-order nonlinear process for both 3.0-nm-sized and 2.3-nm-sized CdS nanocrystals. The experimental results show that the excitonic nonlinear absorption of CdS nanocrystals is greatly enhanced with decreasing particle size. A two-level model is utilized to explain both irradiance and wavelength dependence of the excitonic nonlinearity.
Source arXiv, cond-mat/0507667
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