Optical nonlinear absorption and refraction of CdS and CdS-Ag core-shell quantum dots

被引：62
作者：
Gong, Hong-Mei
Wang, Xiao-Hui
Du, Yu-Min
Wang, Qu-Quan [1 ]
机构：
[1] Wuhan Univ, Key Lab Acoust & Photon Mat & Devices, Minist Educ, Wuhan 430072, Peoples R China
[2] Wuhan Univ, Dept Resource & Environm Sci, Wuhan 430072, Peoples R China
来源：
JOURNAL OF CHEMICAL PHYSICS | 2006年 / 125卷 / 02期
关键词：
NANOCRYSTALS; FILM;
D O I：
10.1063/1.2212400
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The CdS and CdS-Ag core-shell quantum dots (QDs) have been prepared. The nanostructures of the QDs were revealed by transmisson electron microscopy and absorption spectra, respectively. The third-order nonlinear optical properties of the core-shell QDs have been studied by using Z-scan technique with femtosecond pulses at the wavelength of 790 nm. The value of the effective nonlinear absorption coefficient beta(eff) of CdS-Ag QDs is measured to be about 16.8 cm/GW, which is about 400 times larger than that of bare CdS QDs of 3.9x10(-2) cm/GW. The nonlinear refraction index gamma of CdS-Ag QDs is about -2.3x10(-4) cm(2)/GW, which is about 200 times larger than that of bare CdS QDs of 1.0x10(-6) cm(2)/GW. (c) 2006 American Institute of Physics.
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页数：4
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