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Realizing Fano-like resonance in a one terminal closed T-shaped waveguide

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Abstract

We obtain a special Fano-like resonance in a semi-closed T-shaped waveguide with nanodisk resonator, in which only two bright plasmon modes work. It is found that the transmission spectrum occurs a red-shift by increasing either length of the nanoslot or radius of the nanodisk. Moreover, when the length of the nanoslot and radius of the nanodisk reach to some particular values at the same time, the transmission spectrum will show an inverse line shape or the Fano-like resonance will disappear. Meanwhile, the classical figure of merit obtained by calculation is as high as 199 with a sizable classical sensitivity value reaches to 1114 nm/RIU. The generalized figure of merit also comes to an impressive value of 7961 nm/RIU. Besides, it is worth noting that the maximums of these two kinds of FOM lie in the dips of different linewidth, which can be utilized in diverse types of sensors. Our studies further provide a guidance for fabricating planar devices in near-infrared region.

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Authors and Affiliations

  1. Key Lab for Micro-Nano Physics and Technology, School of Physics and Electronics, Hunan University, Changsha, 410082, P.R. China

    Xiong-Jun Shang, Xiao-Fei Li, Ling-Ling Wang, Xiang Zhai, Qi Lin, Ben-Xin Wang, Gui-Dong Liu, Sheng-Xuan Xia & Quan Li

  2. Department of Electrical and Information Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, P.R. China

    Xiao-Fei Li

Authors
  1. Xiong-Jun Shang
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  2. Xiao-Fei Li
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  3. Ling-Ling Wang
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  4. Xiang Zhai
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  5. Qi Lin
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  6. Ben-Xin Wang
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  7. Gui-Dong Liu
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  8. Sheng-Xuan Xia
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  9. Quan Li
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Correspondence to Xiao-Fei Li or Ling-Ling Wang.

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Shang, XJ., Li, XF., Wang, LL. et al. Realizing Fano-like resonance in a one terminal closed T-shaped waveguide. Eur. Phys. J. B 88, 144 (2015). https://doi.org/10.1140/epjb/e2015-60007-8

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  • DOI: https://doi.org/10.1140/epjb/e2015-60007-8

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