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Enhancement of Raman scattering by individual dielectric microspheres

Authors

  • C. L. Du,

    Corresponding author
    1. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China
    • College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
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  • J. Kasim,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637616
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  • Y. M. You,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637616
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  • D. N. Shi,

    Corresponding author
    1. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China
    • College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
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  • Z. X. Shen

    Corresponding author
    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637616
    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 1 Nanyang Walk, Block 5, Level 3, Singapore 637616.
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Abstract

Enhanced Raman scattering (ERS) from bulk Si and surface brilliant cresyl blue (Bcb) molecules was investigated by individual polystyrene (PS) microspheres placed on top of the samples. It is revealed that the Raman signal depends both on the microsphere size and the numerical aperture (NA) of the collection lens, and a maximum signal enhancement of ∼11- and 40-fold for Si and Bcb is observed, respectively, showing strong ERS effect. The different ERS behavior was elucidated by electromagnetic simulations using the finite element method. The present work also provides information on individual dielectric sphere for applications in microscopy, spectroscopic imaging and improvement, etc. Copyright © 2010 John Wiley & Sons, Ltd.

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