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29 March 2024 |
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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 | Abstract: | 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. | Source: | arXiv, cond-mat/0507667 | Services: | Forum | Review | PDF | Favorites |
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