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Fano Resonance Based on End-Coupled Cascaded-Ring MIM Waveguides Structure

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Abstract

Though adding a groove to a plasmonic end-coupled perfect ring (PR) resonator, two additional resonance modes, which can be controlled by the length of the groove, will arise in this proposed ring-groove (RG) joint metal-insulator-metal (MIM) waveguide. By further cascading, the PR resonator and the RG joint resonator, single and dual Fano resonances with asymmetric line shapes are obtained due to the interference effects between the dark modes and the bright modes. High figure of merit and high refractive-index sensitivity are achieved, and thus this structure is suitable for the biochemistry sensing area. Interestingly, normal and abnormal dispersions are also investigated for the Fano peaks and dips, respectively. The performances of the proposed structure are investigated by using the finite-difference time-domain method.

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Acknowledgements

The work is supported by the National Natural Science Foundation of China under Grants No. 61405039 and No. 61475037, Science and Technology Planning Projects of Guangdong Province, China under Grant No. 2016A020223013, the Natural Science Foundation of Guangdong Province, China, under Grant No. 2014A030310300, the State Key Lab of Optical Technologies for Micro-Engineering and Nano-Fabrication of China, the Foundation for Distinguished Young Talents in Higher Education of Guangdong, China, under Grant No. 2014KQNCX066, Research Fund for the Doctoral Program of Higher Education of China under Grant No. 20134407110008, Guangzhou Science and Technology Project of Guangdong Province, China under Grant No. 2016201604030027, Research Project of Guangdong Province under Grant No. 2013B090500035, and the Science and Technology Program of Guangzhou under Grant No. 2014 J4100202.

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Authors and Affiliations

  1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, Guangdong, 510006, China

    Kunhua Wen, Yihua Hu, Li Chen, Jinyun Zhou, Miao He, Liang Lei, Ziming Meng, Yanjie Wu & Jianfeng Li

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  1. Kunhua Wen
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  2. Yihua Hu
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  3. Li Chen
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  4. Jinyun Zhou
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  5. Miao He
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  7. Ziming Meng
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  8. Yanjie Wu
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Correspondence to Kunhua Wen.

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Wen, K., Hu, Y., Chen, L. et al. Fano Resonance Based on End-Coupled Cascaded-Ring MIM Waveguides Structure. Plasmonics 12, 1875–1880 (2017). https://doi.org/10.1007/s11468-016-0457-1

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  • DOI: https://doi.org/10.1007/s11468-016-0457-1

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