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Ultra-high Sensitivity Plasmonic Nanosensor Based on Multiple Fano Resonance in the MDM Side-Coupled Cavities

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Abstract

We propose a compact plasmonic structure comprising a metal-dielectric-metal (MDM) waveguide coupled with a side cavity and groove resonators. The proposed system is investigated by the finite element method. Simulation results show that the side-coupled cavity supports a local discrete state and the groove provides a continuous spectrum, the interaction between them, gives rise to the Fano resonance. The asymmetrical line shape and the resonant wavelength can be easily tuned by changing the geometrical parameters of the structure. Moreover, we can extend this plasmonic structure by the double side-coupled cavities to gain the multiple Fano resonances. The proposed structure can serve as an excellent plasmonic sensor with a sensitivity of ∼1900 nm/RIU and a figure of merit of about ∼3.8 × 104, which can find wide applications for nanosensors.

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Acknowledgments

This work was supported by Ministry of Science and Technology of China under Grant 2016 YFA 0301300 and by the National Natural Science Foundation of China Grant 11374041, Grant 11574035, Grant 11404030, and Grant 61571060 and Fund of State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Tele-communications), People’s Republic of China.

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Authors and Affiliations

  1. State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Yunyun Zhang, Shilei Li, Zhao Chen, Ping Jiang, Rongzhen Jiao, Yong Zhang, Lulu Wang & Li Yu

  2. School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Yunyun Zhang, Shilei Li, Zhao Chen, Ping Jiang, Rongzhen Jiao, Yong Zhang, Lulu Wang & Li Yu

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  1. Yunyun Zhang
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  2. Shilei Li
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  3. Zhao Chen
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  4. Ping Jiang
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  5. Rongzhen Jiao
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  6. Yong Zhang
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  7. Lulu Wang
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  8. Li Yu
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Correspondence to Li Yu.

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Zhang, Y., Li, S., Chen, Z. et al. Ultra-high Sensitivity Plasmonic Nanosensor Based on Multiple Fano Resonance in the MDM Side-Coupled Cavities. Plasmonics 12, 1099–1105 (2017). https://doi.org/10.1007/s11468-016-0363-6

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  • DOI: https://doi.org/10.1007/s11468-016-0363-6

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