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Citation: Yu ZHANG, Xin WANG, Ming MA, De Gang FU, Ning GU, Ju Zheng LIU, Zu Hong LU, Ling XU, Jun XU, Kun Ji CHEN. Size Dependence of First-order Hyperpolarizability of CdS Nanoparticles Studied by Hyper-Rayleigh Scattering[J]. Chinese Chemical Letters, ;2003, 14(9): 948-951. shu

Size Dependence of First-order Hyperpolarizability of CdS Nanoparticles Studied by Hyper-Rayleigh Scattering

Yu ZHANG ^1,2, ,
Xin WANG ² ,
Ming MA ² ,
De Gang FU ² ,
Ning GU ² ,
Ju Zheng LIU ² ,
Zu Hong LU ² ,
Ling XU ¹ ,
Jun XU ¹ ,
Kun Ji CHEN ¹

1.
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093;
2.
National Laboratory of Molecular and Biomolecular Electronics, Southeast University, Nanjing 210096

Received Date: 28 January 2001

Fund Project: 10074023)and the National Postdoctoral Foundation (No.2002031222).This work was supported by the National Natural Science Foundation of China (Nos.50202009

The second-order optical nonlinearity of CdS nanoparticles with different diameters of 28.0, 30.0, 31.5, 50.0, and 91.0 Å was studied by hyper-Rayleigh scattering technique.Results show that the first-order hyperpolarizability β value per CdS particle decreases as size is reduced to diameter of 31.5 Å; however, as CdS size further decreases, this trend is reversed and β value increases.Substantially, the normalized β value per CdS formula unit, β₀, exhibits systematic enhancement with decreasing size.This phenomenon is interpreted in terms of a so-called surface contribution mechanism.
- CdS nanoparticles,
- hyper-Rayleigh scattering,
- second-order optical nonlinearity,
- size dependence,
- surface contribution
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