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Broadband light output enhancement for scintillator using whispering-gallery modes in nanospheres

Authors

  • Zhichao Zhu,

    1. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physical Science and Engineering, Tongji University, Shanghai, P.R. China
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  • Bo Liu,

    Corresponding author
    1. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physical Science and Engineering, Tongji University, Shanghai, P.R. China
    • Corresponding author: e-mail lbo@tongji.edu.cn, Phone: +86 21 65989875, Fax: +86 21 65980219

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  • Chuanwei Cheng,

    1. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physical Science and Engineering, Tongji University, Shanghai, P.R. China
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  • Hong Chen,

    1. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physical Science and Engineering, Tongji University, Shanghai, P.R. China
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  • Mu Gu,

    1. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physical Science and Engineering, Tongji University, Shanghai, P.R. China
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  • Yasha Yi,

    1. Integrated Nano Optoelectronics Laboratory, Department of Electrical and Computer Engineering, University of Michigan, Dearborn, MI, USA
    2. Materials Processing Center, Massachusetts Institute of Technology, Cambridge, MA, USA
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  • Rihua Mao

    1. Laboratory for Advanced Scintillation Materials and Performance, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, P.R. China
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Abstract

An array of monolayer of periodic nanospheres is used to efficiently extract the light from a scintillator of high refractive index with broadband capability. Compared with the plain sample without nanospheres, the enhancement of wavelength- and angle-integrated luminescence by 72 and 68% can be achieved under the excitation of ultraviolet and γ-ray radiation, respectively. The whispering-gallery modes for the individual sphere and the periodic arrangement are responsible for the enhancement of light extraction. Such a photonic structure is advantageous over the traditional two-dimensional photonic crystal.

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