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Proceedings Paper

Optical nonlinear properties of water-soluble CdSeS quantum dot
Author(s): Feng Wu; Lina Ma; Wei Tian; Wenju Chen; Guilan Zhang; Guofeng Zhao; Shidong Cao; Wei Xie
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Paper Abstract

The optical nonlinear properties of water-soluble quantum dot have been investigated by using the Z-scan technique with the second-harmonic generation(532nm) of the mode-locked Nd:YAG laser. According to the absorption spectrum, it is concluded that the absorption at 532nm is the two photon absorption process. On the basis of the open-aperture Z-scan measurements, the TPA coefficients and corresponding TPA cross sections for the four different pulse irradiances are presented. The experimental results show the water-soluble CdSeS quantum dot possesses large two-photon absorption (TPA) at 532nm wavelength. In addition, we also calculate the nonlinear refractive index and third-order nonlinear susceptibility. It is found that the two photon absorption coefficients depend on the intensity of the laser and the nonlinear refractive index is independent of the laser irradiance. All the results indicate that it is possible for CdSeS quantum dot be a promising material for biological fluorescence label and imaging.

Paper Details

Date Published: 4 January 2008
PDF: 8 pages
Proc. SPIE 6839, Nonlinear Optics: Technologies and Applications, 683925 (4 January 2008); doi: 10.1117/12.757681
Show Author Affiliations
Feng Wu, Nankai Univ. (China)
North Univ. of China (China)
Lina Ma, Nankai Univ. (China)
Wei Tian, Nankai Univ. (China)
Wenju Chen, Nankai Univ. (China)
Guilan Zhang, Nankai Univ. (China)
Guofeng Zhao, Yourui Quantum Dots Co. of Technology Development (China)
Shidong Cao, Yourui Quantum Dots Co. of Technology Development (China)
Wei Xie, Yourui Quantum Dots Co. of Technology Development (China)

Published in SPIE Proceedings Vol. 6839:
Nonlinear Optics: Technologies and Applications
Yiping Cui; Qihuang Gong; Yuen-Ron Shen, Editor(s)

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