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《Acta Physica Sinica》 2008-10
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Linear and nonlinear optical properties of CdSe quantumn dots

Zhu Bao-Hua~(1)2)) Wang Fang-Fang~(1)) Zhang Kun~(1)) Ma Guo-Hong~(3)) Gu Yu-Zong~(1)) Guo Li-Jun~(1)) Qian Shi-Xiong~(4))1)(Institute of Optics and Optoelectronics Technique,Henan University,Kaifeng 475004,China)1)(College of Information and Technology,Nanjing Forestry University,Nanjing 210037,China)3)(School of Science,Shanghai University,Shanghai 200444,China) 4)(Department of Physics,Fudan University,Shanghai 200433,China)  
On the basis of measurement and theoretical analysis,the linear and nonlinear optical properties of the CdSe quantumn dots with different nanoparticle sizes were investigated.The relation between the nanoparticle size and the absorption peak of CdSe quantumn dots was characterized by UV-VIS-NIR spectroscopy,and the dependence of third-order nonlinear susceptibility of quantumn dots on nanoparticle size was investigated by picosecond Z-scan technique with different excitation wavelengths(532 nm and 1064 nm,resp.).The analysis of optical properties of the films was carried out using the theory of localized field enhancement.The experimental and theoretical results showed the dependence of third-order nonlinear susceptibilities χ~(3) on the CdSe nanoparticle size.With CdSe nanoparticle size around 4.3 nm and the excitation wavelength of 532 nm,which was close to the resonance,the third-order nonlinear susceptibility χ~(3) showed a maximum value of 2.0×10~(-11) esu.
【Fund】: 国家自然科学基金(批准号:60476001);; 河南大学自然科学基金(批准号:05ZDZR008)资助的课题~~
【CateGory Index】: O471.1
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