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Linear and nonlinear optical properties of CdSe quantumn dots

Zhu Bao-Hua Wang Fang-Fang Zhang Kun Ma Guo-Hong Gu Yu-Zong Guo Li-Jun Qian Shi-Xiong

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Linear and nonlinear optical properties of CdSe quantumn dots

Zhu Bao-Hua, Wang Fang-Fang, Zhang Kun, Ma Guo-Hong, Gu Yu-Zong, Guo Li-Jun, Qian Shi-Xiong
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  • 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 (532nm and 1064nm,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 4.3nm and the excitation wavelength of 532nm, which was close to the resonance, the third-order nonlinear susceptibility χ(3) showed a maximum value of 2.0×10-11 esu.
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Publishing process
  • Received Date:  30 December 2007
  • Accepted Date:  20 March 2008
  • Published Online:  05 May 2008

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