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|Title:||Excitonic nonlinear absorption in CdS nanocrystals studied using Z-scan technique|
|Authors:||He, J. |
|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|
|Appears in Collections:||Staff Publications|
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