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Surface Plasmon Resonance Intensification by Cavity-Ring Plasma Structure in the Giga-Hertz Regime

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Abstract

In this paper, we propose a novel sub-wavelength plasma structure that can effectively enhance surface plasmon resonance (SPR) to achieve a significant local field. On the basis of a plasma ring structure, we add a slit and two thin plasma layers, working as a metal-insulator-metal (MIM) waveguide at a specific incident wave frequency and generate the Fabry-Perot resonance (FPR). The structure thus couples the incident wave energy to the vicinity of the slit and intensifies the SPR inside the plasma ring. In addition, we also find the coupling and competing between SPR and FPR. For the coupling mode, the average field enhancement in the ring is up to a factor of 9.7. Moreover, the optimized thickness of the plasma layer is much thinner than the skin depth of the plasma to ensure the incident wave easily entering the MIM waveguide. We further calculate the dispersion relationship of surface plasmon polaritons in the waveguide cavity. The simulation results and theoretical dispersion function are in good agreements.

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Funding

This work has been supported partially by the National Natural Science Foundation of China (Grant Nos. 1187050396, 11875118, 41674165).

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Authors and Affiliations

  1. Department of Physics, Harbin Institute of Technology, Harbin, 150001, China

    Binnan Qu, **aogang Wang & Bowen Li

  2. School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin, 150001, China

    Peiqi Chen & Qiuyue Nie

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  1. Binnan Qu
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  2. **aogang Wang
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  3. Bowen Li
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  4. Peiqi Chen
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  5. Qiuyue Nie
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Correspondence to **aogang Wang.

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Qu, B., Wang, X., Li, B. et al. Surface Plasmon Resonance Intensification by Cavity-Ring Plasma Structure in the Giga-Hertz Regime. Plasmonics 15, 1591–1597 (2020). https://doi.org/10.1007/s11468-020-01180-0

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