Abstract
In this paper, a novel metallic nanostructure consisting of two rings with different diameter is proposed to generate intense plasmonic Fano Resonances (FRs). In this nanostructure, the FRs is explained by the interference between spectrally overlapping narrow subradiant (dark) and broad superradiant (bright) plasmonic modes and is simulated by COMSOL Multiphysics based on Finite Element Method. The simulation shows that dipolar resonance only occurs in the small-diameter ring as a bright plasmon mode, other than the large-diameter ring. It can be found that the Fano resonance can be generated in a metallic nanostructure consisting of two rings with different diameter. Such structure will have many potential applications in the field of chemical and biological sensors in the future.
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