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Ultra-High Sensitivity Nanosensor Based on Multiple Fano Resonance in the MIM Coupled Plasmonic Resonator

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Abstract

This paper proposes a compact plasmonic structure that is composed of a metal-insulator-metal (MIM) waveguide coupled with a groove and stub resonators, and then investigates it by utilizing the finite element method (FEM). Simulation results show that the interaction between the local discrete state caused by the stub resonator and the continuous spectrum caused by the groove resonator gives rise to one of the two Fano resonances, while the generation of the other resonance relies only on the groove. Meanwhile, the asymmetrical linear shape and the resonant wavelength can be easily tuned by changing the parameters of the structure. By adding stubs on the groove, we excited multiple Fano resonances. The proposed structure can serve as an excellent plasmonic sensor with a sensitivity of 2000 nm/RIU and a figure of merit of about 3.04 × 103, which can find extensive applications for nanosensors.

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Authors and Affiliations

  1. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Line 1: Xitucheng Road NO.10, Beijing, 100876, China

    Tonggang Zhao & Shilin Yu

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  1. Tonggang Zhao
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  2. Shilin Yu
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Correspondence to Tonggang Zhao.

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Zhao, T., Yu, S. Ultra-High Sensitivity Nanosensor Based on Multiple Fano Resonance in the MIM Coupled Plasmonic Resonator. Plasmonics 13, 1115–1120 (2018). https://doi.org/10.1007/s11468-017-0610-5

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  • DOI: https://doi.org/10.1007/s11468-017-0610-5

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