Excitonic nonlinear absorption in CdS nanocrystals studied using Z-scan technique

Details Excitonic nonlinear absorption in CdS nanocrystals studied using Z-scan technique Excitonic nonlinear absorption in CdS nanocrystals studied using Z-scan technique

2005-07-28

arxiv.org/abs/cond-mat/0507667v1

J. Appl. Phys. 95, 6381 (2004)

Physics

Condensed Matter

Materials Science

24 pages, 6 figures

Scientific paper

10.1063/1.1711183

Irradiance 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.

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