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A tunable bistable device based on a coupled quantum dot–metallic nanoparticle nanosystem

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Abstract

We theoretically propose a scheme of a tunable bistable device based on a coupled semiconductor quantum dot–metal nanoparticle nanosystem in the simultaneous presence of a strong pump laser and a weak probe laser with different frequencies. The results show that it is easy to turn on or off the optical bistable effect in such system by switching the polarization direction of the pump field, and the bistability thresholds are highly sensitive to the intensity, frequency, polarization direction of the pump field, and the interparticle distance. In addition, the nonlinear absorption in the two stable states exhibits a ratio as high as 104 arising from the three-photon effect, which implies that our nanosystem can also be used as an optical memory cell.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11404410 and 11174372), the Hunan Provincial Natural Science Foundation (Grant No. 14 JJ3116), and the Foundation of Talent Introduction of Central South University of Forestry and Technology (Grant No. 104-0260).

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Authors and Affiliations

  1. Institute of Mathematics and Physics, Central South University of Forestry and Technology, Changsha, 410004, China

    Jian-Bo Li, Meng-Dong He, Li-Qun Chen, Xin-Jun Wang & Xiao-Fang Peng

  2. Department of Physics, Hunan Normal University, Changsha, 410081, China

    Shan Liang

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  1. Jian-Bo Li
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  2. Shan Liang
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  3. Meng-Dong He
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  4. Li-Qun Chen
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  6. Xiao-Fang Peng
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Correspondence to Jian-Bo Li.

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Li, JB., Liang, S., He, MD. et al. A tunable bistable device based on a coupled quantum dot–metallic nanoparticle nanosystem. Appl. Phys. B 120, 161–166 (2015). https://doi.org/10.1007/s00340-015-6119-8

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  • DOI: https://doi.org/10.1007/s00340-015-6119-8

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