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Ring Gap Resonance Modes on Disk/Film Coupling System Caused by Strong Plasmon Interaction

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Abstract

Ring modes with large wave vectors cannot be easily excited on a single disk by the plane wave illumination with the polarization parallel to the disk interface. In this work, we show that special antisymmetric ring gap modes on the surface of the disk in close proximity to the metallic thin film can be excited in the visible light region of the electromagnetic spectrum. In the presence of the film, the strong plasmon interaction between disk and film causes ring gap modes to have lower energies and be more easily excited. We apply the plasmon hybridization method to illustrate the ring gap modes arising from the interaction between the localized disk plasmons and the continuum surface plasmons. The calculated hybridization data show good agreement with the results of finite element simulations. The excitation of ring gap modes provides further insight into the strong coupling of plasmons and the design of novel nanostructures.

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Availability of Data and Material

The data and material that support the findings of this study are available from the corresponding author upon reasonable request.

Code availability

The codes generated during the current study are available from the corresponding author on reasonable request.

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Funding

This research was supported by the National Natural Science Foundation of China (Grant Nos. 12074054, 11704058) and the Fundamental Research Funds for the Central Universities (Grant No. DUT21LK06).

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Author notes

  1. Guodong Zhu and Linhong Qv contributed equally.

Authors and Affiliations

  1. Key Laboratory of Materials Modification By Laser, Electron, and Ion Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Guodong Zhu, Linhong Qv, Yangzhe Guo & Yurui Fang

Authors
  1. Guodong Zhu
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  2. Linhong Qv
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  3. Yangzhe Guo
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  4. Yurui Fang
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Contributions

Y. F. conceived the idea and supervised the work. G. Z. deducted the hybridization thoery and finished the calculations with MATLAB code. L. Q. did the FEM simulations. Y. G. did part of the simulations and plotted part of the figures. G. Z and L. Q wrote the manuscript. All of the authors revised the paper.

Corresponding author

Correspondence to Yurui Fang.

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The authors declare no competing interests.

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Zhu, G., Qv, L., Guo, Y. et al. Ring Gap Resonance Modes on Disk/Film Coupling System Caused by Strong Plasmon Interaction. Plasmonics 17, 87–93 (2022). https://doi.org/10.1007/s11468-021-01491-w

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  • DOI: https://doi.org/10.1007/s11468-021-01491-w

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