| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Third-Order Nonlinear Optical Response near the Plasmon Resonance Band of Cu$_{2-x}$Se Nanocrystals |
| Lan-Qing Zhou1,2, Yan-Bang Zhang3, Teng-Fei Yan2, Ying Li2, Guo-Zhi Jia3, Huai-Zhe Xu1, Xin-Hui Zhang2,4** |
1State Key Laboratory of Software Development Environment and Department of Physics, Beihang University, Beijing 100191
2State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Science, P. O. Box 912, Beijing 100083
3School of Science, Tianjin Chengjian University, Tianjin 300384
4College of Materials Science and Opto-electronic Technology, University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Lan-Qing Zhou, Yan-Bang Zhang, Teng-Fei Yan et al 2017 Chin. Phys. Lett. 34 014205 |
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Abstract The third-order nonlinear optical properties of water-soluble Cu$_{2-x}$Se nanocrystals are studied in the near infrared range of 700–980 nm using a femtosecond pulsed laser by the $Z$-scan technique. It is observed that the nonlinear optical response of Cu$_{2-x}$Se nanocrystals is sensitively dependent on the excitation wavelength and exhibits the enhanced nonlinearity compared with other selenides such as ZnSe and CdSe. The W-shaped $Z$-scan trace, a mixture of the reversed saturated absorption and saturated absorption, is observed near the plasmon resonance band of Cu$_{2-x}$Se nanocrystals, which is attributed to the state-filling of free carriers generated by copper vacancies (self-doping effect) of Cu$_{2-x}$Se nanocrystals as well as the hot carrier thermal effect upon intense femtosecond laser excitation. The large nonlinear optical response and tunable plasmonic band make Cu$_{2-x}$Se nanocrystals promising materials for applications in ultra-fast all-optical switching devices as well as nonlinear nanosensors.
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Received: 08 October 2016
Published: 29 December 2016
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| PACS: |
42.65.An
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(Optical susceptibility, hyperpolarizability)
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42.70.Nq
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(Other nonlinear optical materials; photorefractive and semiconductor materials)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11274302, 11474276 and 11674240. |
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