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Coupled-Resonator-Induced Fano Resonances for Plasmonic Sensing with Ultra-High Figure of Merits

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Abstract

Fano resonances are numerically predicted in an ultracompact plasmonic structure, comprising a metal-isolator-metal (MIM) waveguide side-coupled with two identical stub resonators. This phenomenon can be well explained by the analytic model and the relative phase analysis based on the scattering matrix theory. In sensing applications, the sensitivity of the proposed structure is about 1.1 × 103 nm/RIU and its figure of merit is as high as 2 × 105 at λ = 980 nm, which is due to the sharp asymmetric Fano line-shape with an ultra-low transmittance at this wavelength. This plasmonic structure with such high figure of merits and footprints of only about 0.2 μm2 may find important applications in the on-chip nano-sensors.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant nos. 11204018, 61177085, and 51172030) and the National Basic Research Program of China (Grants 2010CB923200, 2009CB930504, and 2013CB328704).

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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

    Jianjun Chen, Zhongliang Deng & Jinghua Xiao

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

    Jianjun Chen & Jinghua Xiao

  3. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing, 100871, China

    Zhi Li & Qihuang Gong

  4. Physics Department, University of Alabama at Birmingham, Birmingham, 35294, USA

    Yujiao Zou

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  1. Jianjun Chen
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  2. Zhi Li
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  3. Yujiao Zou
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  4. Zhongliang Deng
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  5. Jinghua Xiao
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  6. Qihuang Gong
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Correspondence to Jianjun Chen.

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Chen, J., Li, Z., Zou, Y. et al. Coupled-Resonator-Induced Fano Resonances for Plasmonic Sensing with Ultra-High Figure of Merits. Plasmonics 8, 1627–1631 (2013). https://doi.org/10.1007/s11468-013-9580-4

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  • DOI: https://doi.org/10.1007/s11468-013-9580-4

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