Abstract
An asymmetric trimeric slit metasurface structure is proposed herein, which generated independently tunable double Fano resonances (DFRs), namely, Fano1 and Fano2. Rigorous simulations and experimental scanning near-field demonstrated that the non-radiative dark mode produces Fano1, while the magnetic toroidal mode generates peak Fano2. The mechanisms of the two Fano resonances infer that interference fields can be independently tuned by different geometric parameters. The separate tuning of DFRs is simultaneously generated in the asymmetric slit metasurface. These results imply the potential applications of Fano resonances, such as lasing and sensing.
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