We experimentally demonstrate a classical analogue of double Fano resonances in a planar composite metamaterial possessing tripod plasmonic resonances, where a common subradiant dipole corresponding to the dark mode is coupled with two superradient dipoles corresponding to two bright modes. The composite metamaterial is structured such that four-rod resonators (FRR) are embedded inside double-split ring resonators (DSRR) superlattice. Two dipole resonances of DSRR are superradiant modes and one dipole resonance of FRR is subradiant mode. Proximity of the inner diameter of DSRR and the rod-length of FRR permits near field coherent couplings, and the composite metamaterial is a tripod metamaterial system possessing two superradiant dipole resonances of DSRR coupled coherently with one common subradiant dipole resonance of FRR in near field, similar to a tripod atomic system with four atomic levels coupled coherently by coherent optical fields. Important finding is that double Fano resonances in the composite metamaterial are correlated, showing up as a transfer of the absorbed power from one superradiant dipole to the other superradient dipole in DSRR. The general feature of plasmonic Fano resonance is examined where both superradiant and subradiant oscillators are externally driven. Analysis based on two coupled oscillators model leads to the fact that the characteristic asymmetric Fano resonance formula of plasmonic structure is kept the same with a modication in the asymmetry parameter q.
Jeong-Weon Wu, Y. U. Lee, E. Y. Choi, E. S. Kim, J. H. Woo, B. Kang, J. Kim, Byung Cheol Park, T. Y. Hong, and Jae Hoon Kim, "Double Fano resonances in a composite metamaterial possessing tripod plasmonic resonances (Presentation Recording)," Proc. SPIE 9544, Metamaterials, Metadevices, and Metasystems 2015, 95442N (Presented at SPIE Nanoscience + Engineering: August 13, 2015; Published: 5 October 2015); https://doi.org/10.1117/12.2186094.4519316188001.
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