Abstract
In this paper, two Fano resonances are achieved in the proposed plasmonic system. Theoretical analysis and simulation results show that two discrete states coupled with a continua lead to these Fano resonances. The discrete states are provided by the side-coupled square cavity, and a baffle plate placed in metal-dielectric-metal waveguide is used to produce a continuous transmission spectrum. The resonant wavelengths and the linewidth of these Fano resonances can be easily tuned by adjusting the parameters of system. This system exhibits high sensitivities as high as 850 and 1120 nm/RIU corresponding to two Fano resonances, and the figure of merit can reach to 1.7 × 105 by optimizing the system. By introducing another square cavity, four Fano resonances are obtained which originate from four discrete states coupled with continua, and they can be tuned independently. The flexible multi-Fano resonances system has significant application bio-nanosensor, nonlinear, and slow light devices.
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Acknowledgements
This work was supported by the Ministry of Science and technology of China (Grant No. 2016YFA0301300), the National Natural Science Foundation of China (Grant 11374041, Grant 11574035 and Grant 11404030), and the Fund of State Key Laboratory of Information Photonics, and the Optical Communications (Beijing University of Posts and Telecommunications), People’s Republic of China.
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Yang, J., Song, X., Chen, Z. et al. Tunable Multi-Fano Resonances in MDM-Based Side-Coupled Resonator System and its Application in Nanosensor. Plasmonics 12, 1665–1672 (2017). https://doi.org/10.1007/s11468-016-0432-x
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DOI: https://doi.org/10.1007/s11468-016-0432-x