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Analytical Determination of Plasmon Resonances in MIM Nanocavities

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Abstract

Optical interactions in many metallic nanostructures involve plasmon resonances in the basic elements of metal-insulator-metal (MIM) nanocavities. Though the resonances can be theoretically studied with numerical simulations, an analytical approach is highly needed for its advantage in physical analysis and target-oriented design of structures. But it is often obstructed by the difficulty in calculation of reflection coefficients of the surface plasmon (SP) waves at terminals of the MIM nanocavities. Here, we use the permittivity of real metals, instead of perfect electric conductors, to have a discussion on the study of this issue by R. Gordon [PRB, 73, 153405, 2006], to clarify the applicability of this method to calculate SP reflection coefficients. Further, based on the Fabry-Perot cavity model, plasmon resonances in metallic nanoslit and nanogroove cavities are studied and compared with results obtained from rigorous numerical simulations.

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Funding

This study was funded by the NSFC (No. 61275063, 61205051), the National Key Scientific Program (No. 2012CB933503), Natural Science Foundation of Fujian Province of China (No. 2013J05097, 2014J01027), and the Fundamental Research Funds for the Central Universities (No. 20720140531, 20720150032).

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The authors declare that they have no competing interests.

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Authors and Affiliations

  1. Department of Physics, Xiamen University, Xiamen, 361005, China

    Ling Guo & Zhijun Sun

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  1. Ling Guo
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  2. Zhijun Sun
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Correspondence to Zhijun Sun.

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Guo, L., Sun, Z. Analytical Determination of Plasmon Resonances in MIM Nanocavities. Plasmonics 10, 1625–1629 (2015). https://doi.org/10.1007/s11468-015-9985-3

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  • DOI: https://doi.org/10.1007/s11468-015-9985-3

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