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Plasmon-Induced Transparency and Refractive Index Sensing in Side-Coupled Stub-Hexagon Resonators

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Abstract

A nanoscale structure which comprises metal-insulator-metal (MIM) waveguide, stub resonator, and hexagonal resonator is proposed to realize plasmon-induced transparency (PIT) response. The characteristics of the device are numerically investigated with different geometrical parameters. Benefitting from the narrow transparency window and long coupling length between two resonators, the proposed devices are able to act as a nanosensor for refractive index (RI) sensing with figure-of-merit (FOM) of 178 and 140 RIU−1 near RI of 1 and 1.33, respectively. Furthermore, the FOM can be further improved by employing symmetric structure.

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Acknowledgements

This work was partially supported by the National Natural Science Foundation of China (61605179), the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (162301132703, and G1323511665), and the 863 High Technology Plan (2015AA015502).

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Authors and Affiliations

  1. School of Mechanical Engineering and Electronic Information, China University of Geosciences (Wuhan), Wuhan, 430074, China

    Chuan Wu, Huafeng Ding, Tianye Huang, Xu Wu, Bingwei Chen & Kaixuan Ren

  2. National Engineering Laboratory for Next Generation Internet Access System, School of Optics and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei, China

    Songnian Fu

Authors
  1. Chuan Wu
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  2. Huafeng Ding
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  3. Tianye Huang
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  4. Xu Wu
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  5. Bingwei Chen
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  6. Kaixuan Ren
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  7. Songnian Fu
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Correspondence to Tianye Huang.

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Wu, C., Ding, H., Huang, T. et al. Plasmon-Induced Transparency and Refractive Index Sensing in Side-Coupled Stub-Hexagon Resonators. Plasmonics 13, 251–257 (2018). https://doi.org/10.1007/s11468-017-0506-4

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  • DOI: https://doi.org/10.1007/s11468-017-0506-4

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