Optical nonlinearity enhanced by metal nanoparticle in CdTe quantum dots |
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Authors: | Xiaobo Feng Yanliang ChenDedong Hou |
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Institution: | a School of Physics and Electronic Information Technology, Yunnan Normal University, Kunming 650092, China b Department of Physics, National University of Singapore, Singapore 117542, Singapore c Guangdong Planning and Designing Institute of Telecommunications Co., LTD, Guangzhou 510630, China |
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Abstract: | The optical nonlinearity of a CdTe quantum dot enhanced by a gold nanoparticle has been theoretically studied by employing the multi-bands effective mass method. The energy levels have been computed using 6×6 k.p model for the valence band. The semiconductor quantum dot-size-dependent third-order susceptibility of third harmonic generation in a CdTe-Au nanocrystal complex has been analyzed. It is found that the metal nanoparticle enhances the optical nonlinearity of the semiconductor quantum dot due to the dipole/multipole interaction that will bring in the strong damping and the field enhancement. By choosing the radius of CdTe quantum dot, the third-order nonlinear susceptibility for third harmonic generation can be optimized for the one- and multi-photon resonance. Also, we can alter the optical nonlinearity by changing the ratio of semiconductor-metal nanoparticle distance to the metal nanoparticle radius. |
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Keywords: | Optical nonlinearities of condensed matter Quantum dot |
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