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Proceedings Paper

Hyper-Rayleigh scattering of CdS nanoparticles with different surfaces in solution
Author(s): Xin Wang; Yu Zhang; Yaochun Shen; Ming Li; DeGang Fu; Zu-Hong Lu; Yiping Cui
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Paper Abstract

Large third-order susceptibilities, (chi) (3) or (gamma) , have been observed for II-VI semiconductor nanoparticles. However, there are only few studies on the second-order susceptibilities because it is usually believed that the centrosymmetry or near-centrosymmetry of the particles eliminate the (beta) to zero or very small vale, Here the Hyper-Rayleigh scattering (HRS) technique is used to measure the second-order NLO response of nanoscale CdS Colloids with different surfaces in solution, which are denoted by CdS/Cd2+, CdS/S2-, CdS/SC(NH2)2 CdS/AOT- and CdS/Py. The result shows that the 'per particle' (beta) values for CdS nanoparticles are very large. And the (beta) values are different for CdS nanoparticles with different surfaces. Time dependent experiment show that the HRS signal deceases remarkably as time goes by. Further studies reveal that it has mutli-photon fluorescence (MPF) emission under the radiation of 1064 nm for newly made samples, but for aged stable sample the MPF is rather weak. All these experiments show that the HRS and MPF signals are very sensitive to the changes of the nanoparticle surface or the nanoparticle/solution interface. They also give the evidences proving that the surface termination of the crystalline lattice that creates a condition of non- centrosymmetry is contributing to the large (beta) values for CdS nanoparticles.

Paper Details

Date Published: 17 April 2000
PDF: 9 pages
Proc. SPIE 3937, Micro- and Nano-photonic Materials and Devices, (17 April 2000); doi: 10.1117/12.382803
Show Author Affiliations
Xin Wang, Southeast Univ. (China)
Yu Zhang, Southeast Univ. (Hong Kong)
Yaochun Shen, Southeast Univ. (China)
Ming Li, Southeast Univ. (China)
DeGang Fu, Southeast Univ. (China)
Zu-Hong Lu, Southeast Univ. (China)
Yiping Cui, Southeast Univ. (China)

Published in SPIE Proceedings Vol. 3937:
Micro- and Nano-photonic Materials and Devices
Joseph W. Perry; Axel Scherer, Editor(s)

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