Highly Defective Nanocrystals as Ultrafast Optical Switches: Nonequilibrium Synthesis and Efficient Nonlinear Optical Response

  • Xiaowen Zhang
    Xiaowen Zhang
    State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
    Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China
    Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, China
  • Duoduo Zhang
    Duoduo Zhang
    School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
    More by Duoduo Zhang
  • Dezhi Tan*
    Dezhi Tan
    State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
    *Email: [email protected]
    More by Dezhi Tan
  • Yuehui Xian
    Yuehui Xian
    School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
    More by Yuehui Xian
  • Xiaofeng Liu*
    Xiaofeng Liu
    School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
    *Email: [email protected]
    More by Xiaofeng Liu
  • , and 
  • Jianrong Qiu*
    Jianrong Qiu
    State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
    CAS Center for Excellence in Ultra-Intense Laser Science, Chinese Academy of Sciences, Shanghai 201800, China
    *Email: [email protected]
    More by Jianrong Qiu
Cite this: Chem. Mater. 2020, 32, 23, 10025–10034
Publication Date (Web):November 20, 2020
https://doi.org/10.1021/acs.chemmater.0c03235
Copyright © 2020 American Chemical Society
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Abstract

Exploring novel photonic materials with efficient nonlinear optical response is of great significance for ultrafast photonics. The effective defect control approach is a promising technique for the development of ultrafast optical devices because the optical properties and electronic structure of materials depend to a large extent on their defect structure. Here, we demonstrate a universal nonequilibrium strategy of femtosecond laser processing to synthesize a broad range of colloidal nanocrystals with simultaneous generation of abundant defects at room temperature. The defect states endow the nanocrystals with broadband absorption and enhanced nonlinear optical response in the near-infrared region. The highly defective nanocrystals exhibit an ultrafast optical response of about 160 fs and are used to drive an ultrafast optical switch for generation of passively Q-switched laser pulses with a pulse duration of 910 ns at 1.0 μm. The nonequilibrium synthetic strategy offers a scalable and versatile technique for the exploration of defect-mediated physical chemistry and high-performance nonlinear optical devices.

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  • Characterization of fs-MoOx, NbOx, NiOx, and CuOx NCs, calculation and an additional table of the NLO parameters, schematic diagram of the pulsed laser setup, and other additional figures (PDF)

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This article is cited by 3 publications.

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  2. Zhi Chen, Guoping Dong, Jianrong Qiu. Ultrafast Pump‐Probe Spectroscopy—A Powerful Tool for Tracking Spin‐Quantum Dynamics in Metal Halide Perovskites. Advanced Quantum Technologies 2021, 16 , 2100052. https://doi.org/10.1002/qute.202100052
  3. Min Li, Cong Wang, Lude Wang, Han Zhang. Colloidal semiconductor nanocrystals: synthesis, optical nonlinearity, and related device applications. Journal of Materials Chemistry C 2021, 424 https://doi.org/10.1039/D0TC05771A