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Advanced Materials

Broadband Optical Non-linearity Induced by Charge-Transfer Excitons in Type-II CdSe/ZnTe Nanocrystals

Authors

  • Yunlong Liu,

    1. National Laboratory of Solid State Microstructures, School of Physics, School of Engineering and Applied Science, Nanjing University, Nanjing 210093, China
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  • Chunfeng Zhang,

    Corresponding author
    1. National Laboratory of Solid State Microstructures, School of Physics, School of Engineering and Applied Science, Nanjing University, Nanjing 210093, China
    • National Laboratory of Solid State Microstructures, School of Physics, School of Engineering and Applied Science, Nanjing University, Nanjing 210093, China
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  • Huichao Zhang,

    1. Advanced Photonic Center, Southeast University, Nanjing 210096, China
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  • Rui Wang,

    1. National Laboratory of Solid State Microstructures, School of Physics, School of Engineering and Applied Science, Nanjing University, Nanjing 210093, China
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  • Zheng Hua,

    1. National Laboratory of Solid State Microstructures, School of Physics, School of Engineering and Applied Science, Nanjing University, Nanjing 210093, China
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  • Xiaoyong Wang,

    1. National Laboratory of Solid State Microstructures, School of Physics, School of Engineering and Applied Science, Nanjing University, Nanjing 210093, China
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  • Jiayu Zhang,

    Corresponding author
    1. Advanced Photonic Center, Southeast University, Nanjing 210096, China
    • Advanced Photonic Center, Southeast University, Nanjing 210096, China
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  • Min Xiao

    Corresponding author
    1. National Laboratory of Solid State Microstructures, School of Physics, School of Engineering and Applied Science, Nanjing University, Nanjing 210093, China, Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
    • National Laboratory of Solid State Microstructures, School of Physics, School of Engineering and Applied Science, Nanjing University, Nanjing 210093, China, Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
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Abstract

Benefiting from excitonic charge-transfer states, an efficient non-linear optical response is observed in type-II nanocrystals by four-wave mixing when the incident photon energy lies below the bandgaps of constituent semiconductors. The non-linear optical properties in nanocrystals can be manipulated by the band alignment of the core–shell components, which serves as a promising platform to design broadband non-linear optical devices.

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