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Fano Resonance in the Plasmonic Structure of MIM Waveguide with r-Shaped Resonator for Refractive Index Sensor

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Abstract

A plasmonic structure of metal–insulator-metal (MIM) waveguide consisting of a baffle waveguide and an r-shaped resonator is designed to produce Fano resonances. The finite element method is used to analyze the transmission characteristics and magnetic field distributions of the plasmonic structure. The simulation results show that two Fano resonances can be achieved by the interference between a continuum state in the baffle waveguide and a discrete state in the r-shaped resonator. The Fano resonances can be tuned by changing the geometrical parameters of the plasmonic structure. The refractive index sensing is investigated and it is found that the sensitivity is strongly dependent on the geometrical parameters. The maximum sensitivity is 1333 nm/RIU, with the figure of merit of 5876. The results of the designed plasmonic structure offer high sensitivity and nano-scale integration, which are beneficial to nano-scale refractive index sensors, biosensors, and photonic devices.

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Funding

This work was supported in part by the Fundamental Research Funds for the Central Universities (No. 2572019BC04) and in part by the Heilongjiang Provincial Natural Science Foundation of China (No. LH2019F041).

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Authors and Affiliations

  1. College of Science, Northeast Forestry University, Harbin, 150040, China

    Siti Rohimah, He Tian, Jianfeng Chen, **a Li, **ng Liu, **gang Cui & Qiang Xu

  2. Shanghai **n Yue Lian Hui Electronic Technology Co. LTD., Shanghai, 200233, China

    **fang Wang

  3. Jilin Meteorological Information Network Center, Changchun, 130062, China

    Yu Hao

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  1. Siti Rohimah
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  9. Yu Hao
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Contributions

Siti Rohimah has contributed to conceptualization, design, analysis, writing, review, and editing. He Tian has contributed to supervision, funding acquisition, review, and editing manuscript. **fang Wang, Jianfeng Chen, **a Li, **ng Liu, **gang Cui, Qiang Xu, and Yu Hao contributed to validating and editing the manuscript. All authors have read and agreed to the published version of the manuscript.

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Correspondence to He Tian.

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Rohimah, S., Tian, H., Wang, J. et al. Fano Resonance in the Plasmonic Structure of MIM Waveguide with r-Shaped Resonator for Refractive Index Sensor. Plasmonics 17, 1681–1689 (2022). https://doi.org/10.1007/s11468-022-01655-2

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