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High Sensitivity Nanoplasmonic Sensor Based on Plasmon-Induced Transparency in a Graphene Nanoribbon Waveguide Coupled with Detuned Graphene Square-Nanoring Resonators

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Abstract

A novel nanoscale structure for high sensitivity sensing which consists of a graphene nanoribbon waveguide coupled with detuned graphene square-nanoring resonators (GSNR) based on edge mode is investigated in detail. By altering the Fermi energy level of the graphene, the plasmon-induced transparency (PIT) window from the destructive interference between a radiative square-nanoring resonator and a dark square-nanoring resonator can be easily tailored. The coupled mode theory (CMT) is used to show that the theoretical results agree well with the finite difference time domain (FDTD) simulations. This nanosensor yields a ultrahigh sensitivity of ∼2600 nm/refractive index unit (RIU) and a figure of merit (FOM) of ∼54 in the mid-infrared (MIR) spectrum. The revealed results indicate that the Fermi energy level of the graphene and the coupling distance play important roles in optimizing the sensing properties. Our proposed structure exerts a peculiar fascination on the realization of ultra-compact graphene plasmonic nanosensor in the future.

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Acknowledgments

The author Xicheng Yan expresses his deepest gratitude to his advisor Tao Wang for providing guidance during the whole project. This work is supported by the National Natural Science Foundation of China (Grant No. 61006045 and 61376055), and the Fundamental Research Funds for the Central Universities (HUST: 2016YXMS024).

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Authors and Affiliations

  1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China

    Xicheng Yan, Tao Wang, Xu Han, Shuyuan Xiao, Youjiang Zhu & Yunbo Wang

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  1. Xicheng Yan
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  2. Tao Wang
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  3. Xu Han
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  4. Shuyuan Xiao
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  5. Youjiang Zhu
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  6. Yunbo Wang
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Correspondence to Tao Wang.

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Yan, X., Wang, T., Han, X. et al. High Sensitivity Nanoplasmonic Sensor Based on Plasmon-Induced Transparency in a Graphene Nanoribbon Waveguide Coupled with Detuned Graphene Square-Nanoring Resonators. Plasmonics 12, 1449–1455 (2017). https://doi.org/10.1007/s11468-016-0405-0

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