| Citation: | ZHAO Xiao-long, CHANG Xu-yan, LIU Yan-li, ZHANG Zhi-dong. Multi-Fano resonances sensing based on a non-through metal-insulator-metal waveguide coupling D-shaped cavity[J]. Chinese Optics. doi: 10.37188/CO.EN-2025-0017
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A plasmonics waveguide structure that consist of a non-through metal–insulator–metal (MIM) waveguide coupled with a D-shaped cavity was designed. And the transmission properties, magnetic field distribution, and refractive index sensing functionality were simulated using the finite element method (FEM). A multi-Fano resonance phenomenon was clearly observable in the transmission spectra. The Fano resonances observed in the proposed structure arise from the interaction between the discrete states of the D-shaped resonant cavity and the continuum state of the non-through MIM waveguide. The influence of structural parameters on Fano resonance modulation was investigated through systematic parameter adjustments. Additionally, the refractive index sensing properties, based on the Fano resonance, were investigated by varying the refractive index of the MIM waveguide's insulator layer. A maximum sensitivity and FOM of
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