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Mode characteristics of silver-coated inverted-wedge silica microdisks

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  • Special Topic: Microcavity Photonics
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Abstract

The characteristics of whispering gallery modes (WGM) in silver-coated inverted-wedge silica microdisks are theoretically investigated by using finite element method. Dielectric TE mode always exists in silver-coated inverted-wedge resonators; dielectric TM mode tends to couple with SPP modes; only pure interior surface plasmonic polariton (SPP) mode but not pure exterior SPP mode is observed in contrast to the metal-coated cylindrical and toroidal resonators. The dependence of quality factor of different kinds of WGMs on the radius of the resonator and the thickness of the coated silver layer are systematically analyzed. We find that the quality factors of the hybrid WGMs associated with SPP mode can reach 104. The maximum light intensity enhancement in ambient for a hybrid mode consisting of a dielectric TM mode and an exterior SPP mode can be obtained when a silver film of thickness ~40 nm is deposited. The silver-coated inverted-wedge silica resonators may be widely applied in sensing and surface enhanced Raman scattering.

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Authors and Affiliations

  1. The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin, 300457, China

    Fang Bo, XiaoOu Wang, Ying Li, Feng Gao, GuoQuan Zhang & JingJun Xu

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  1. Fang Bo
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  2. XiaoOu Wang
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  3. Ying Li
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  4. Feng Gao
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  5. GuoQuan Zhang
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  6. JingJun Xu
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Correspondence to Fang Bo or GuoQuan Zhang.

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Bo, F., Wang, X., Li, Y. et al. Mode characteristics of silver-coated inverted-wedge silica microdisks. Sci. China Phys. Mech. Astron. 58, 114207 (2015). https://doi.org/10.1007/s11433-015-5722-3

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  • DOI: https://doi.org/10.1007/s11433-015-5722-3

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