Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.1711183
Title: Excitonic nonlinear absorption in CdS nanocrystals studied using Z-scan technique
Authors: He, J. 
Ji, W. 
Ma, G.H. 
Tang, S.H. 
Elim, H.I. 
Sun, W.X. 
Zhang, Z.H. 
Chin, W.S. 
Issue Date: 1-Jun-2004
Citation: He, J., Ji, W., Ma, G.H., Tang, S.H., Elim, H.I., Sun, W.X., Zhang, Z.H., Chin, W.S. (2004-06-01). Excitonic nonlinear absorption in CdS nanocrystals studied using Z-scan technique. Journal of Applied Physics 95 (11 I) : 6381-6386. ScholarBank@NUS Repository. https://doi.org/10.1063/1.1711183
Abstract: The wavelength and irradiance dependence of excitonic nonlinear absorption in cadmium sulfide (CdS) nanocrystals (NC) were investigated. The dependence was analyzed by using Z-scan method with nanosecond laser pulses. The intrinsic excitonic nonlinear absorption was described using a two-level model. It was observed that the nonlinear absorption was increased when the particle size was less than the bulk Bohr diameter due to the quantum confinement effect. A third-order excitonic bleaching at low irradiance and fifth-order excitonic nonlinear absorption at higher irradiance were observed for both 3.0-nm-sized and 2.3-nm-sized CdS NCs.
Source Title: Journal of Applied Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/51776
ISSN: 00218979
DOI: 10.1063/1.1711183
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