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Ultraviolet and visible double Fano resonances of three-dimensional metamaterials by plasmonic coupling with aluminium surface

We theoretically investigate double Fano resonances (FRs) from the ultraviolet to visible range by combining the array of aluminium 3D split-ring resonators (Al 3D-SRRs) and an Al mirror. The interaction between the first-order (1st) magnetic plasmon (MP) mode of the 3D-SRRs and the 1st surface plasmon polariton (SPP) mode propagating on an Al substrate, and the interaction between the second-order (2nd) MP mode and the 2nd SPP mode generate the double narrow FRs. The 2nd ultraviolet FR of the proposed metamaterial has a high refractive index sensitivity of 240 nm RIU−1 and a figure of merit of 22, suggesting promising applications in ultraviolet sensing.