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Metal enhanced fluorescence of Ag-nanoshell dimer

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Abstract

The plasmon modes of Ag-nanoshell dimer on metal enhanced fluorescence (MEF) are studied theoretically. The amplified excitation rate of a dimer (two identical Ag nanoshells) illuminated by a plane wave for exciting a molecule located at the gap center is calculated. Subsequently, the apparent quantum yield of the emission of the excited molecule affected by the dimer is investigated. The multiple multipole method is used for the both simulations. Finally, the enhancement factor of the dimer on the overall photoluminescence of the molecule in terms of the two parameters is evaluated. Our results show that Ag-nanoshell dimer is a dual-band photoluminescence enhancer for MEF at the bonding dipole and quadrupole modes. The former is broadband, and the latter narrowband. Both bands depend on the gap size. Moreover, the average enhancement factor of Ag-nanoshell dimer for MEF with a Stokes shift is discussed.

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Acknowledgements

The research was supported by the National Science Council, Taiwan, R.O.C. (NSC 99-2221-E-182-030-MY3, NSC 100-2221-E-002-041-MY2) and Chang Gung Memorial Hospital (CMRPD290043).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan, 333, Taiwan

    Jiunn-Woei Liaw

  2. Center for Biomedical Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan, 333, Taiwan

    Jiunn-Woei Liaw

  3. Healthy Aging Research Center, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan, 333, Taiwan

    Jiunn-Woei Liaw

  4. Institute of Applied Mechanics, National Taiwan University, 1, Sec. 4, Roosevelt Rd., Taipei, 106, Taiwan

    Huang-Chih Chen, Bae-Renn Chen & Mao-Kuen Kuo

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  1. Jiunn-Woei Liaw
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  2. Huang-Chih Chen
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  3. Bae-Renn Chen
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  4. Mao-Kuen Kuo
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Correspondence to Jiunn-Woei Liaw or Mao-Kuen Kuo.

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Liaw, JW., Chen, HC., Chen, BR. et al. Metal enhanced fluorescence of Ag-nanoshell dimer. Appl. Phys. A 115, 45–52 (2014). https://doi.org/10.1007/s00339-013-7925-7

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  • DOI: https://doi.org/10.1007/s00339-013-7925-7

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