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Ultra-high figure of merit refractive index sensor based on concentric ring and disk resonator

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Abstract

A plasmonic refractive index sensor based on metal–insulator–metal (MIM) waveguide coupled with concentric ring and disk resonator (CRDR) is proposed in this work. The plasmonic refractive index sensor with a sensitivity of 1039 nm/RIU and a high figure of merit (FOM) of 401 in the near-infrared region is numerically investigated using a finite element method (FEM). The physical mechanism of high Q factor of the mode of CRDR can be explained by the coupled mode theory. The structural parameters of the plasmonic sensor are also discussed. The structural parameters can be changed to adjust the sensor properties. Furthermore, the application of proposed plasmonic sensor in bio-sensing is analyzed.

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Funding

This work is supported by the National Natural Science Foundation of China (11504185, 61178004, 11874229); Natural Science Foundation of Tianjin City (20JCQNJC01410); Science and Technology Commission of Tianjin Binhai New Area (BHXQKJXM-PT-ZJSHJ-2017003); 111 Project (B07013); Program for Changjiang Scholars and Innovative Research Team in Nankai University (IRT_13R29); and Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. MOE Key Laboratory of Weak Light Nonlinear Photonics, Tianjin Key Laboratory of Photonics Material and Technology, School of Physics, Nankai University, Tianjin, 300071, People’s Republic of China

    Hui Guo, Zongqiang Chen, Jiwei Qi, Jing Chen, Yudong Li & Qian Sun

  2. Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, 510632, China

    Meiling Jiang

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  1. Hui Guo
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  2. Zongqiang Chen
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  3. Jiwei Qi
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Correspondence to Zongqiang Chen.

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Guo, H., Chen, Z., Qi, J. et al. Ultra-high figure of merit refractive index sensor based on concentric ring and disk resonator. J Opt 52, 120–127 (2023). https://doi.org/10.1007/s12596-022-00915-y

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