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Optical Nonlinear Properties of CdSeS/ZnS Core/Shell Quantum Dots |
| WU Feng1,2;TIAN Wei1;MA i-Na1;CHEN Wen-Ju1;ZFANG Gui-Lan1;ZHAO Guo-Feng3;CAO Shi-Dong3;XIE Wei3 |
| 1Laboratory of Optoelectronics Information Science and Technology, Institute of Modern Optics, Nankai University, Tianjin 3000712Departments of Physics, North University of China, Taiyuan 0300513Yourui Quantum Dots Company of Technology Development, Tianjin 300071 |
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| Cite this article: |
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WU Feng, TIAN Wei, MA i-Na et al 2008 Chin. Phys. Lett. 25 1461-1464 |
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Abstract The optical nonlinear properties of CdSeS/ZnS quantum dots (QDs) are
investigated by Z-scan technique using fundamental harmonic generation
(1064nm) of mode-locked Nd:YAG laser for the first time. The experimental results show that two photon absorptions (TPA) occur at input intensity up to 12.5GW/cm2. CdSeS/ZnS QDs have an average TPA cross section of 13710GM and large nonlinear refractive index on order of 10-7esu. The large optical nonlinearities perhaps allow the CdSeS/ZnS QDs to be one kind of candidate material for bioimaging and fluorescence label, optical limiting and all-optical switching.
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78.67.Hc
42.65.-k
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Received: 19 December 2007
Published: 31 March 2008
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