Y U Lee1, E Y Choi1, E S Kim1, J H Woo1, B Kang1, J Kim1, Byung Cheol Park2, T Y Hong2, Jae Hoon Kim2 and J W Wu1
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1 Department of Physics and Quantum Metamaterials Research Center, Ewha Womans University, Seoul 120-750, Korea
2 Department of Physics, Yonsei University, Seoul 120-749, Korea
2 Department of Physics, Yonsei University, Seoul 120-749, Korea
By embedding four-rod resonators inside a double-split ring resonator superlattice, a planar composite metamaterial possessing tripod plasmonic resonances is fabricated. Double Fano resonances are observed where a common subradiant driven oscillator is coupled with two superradiant oscillators. As a classical analogue of a four-level tripod atomic system, the extinction spectrum of the composite metamaterial exhibits a coherent effect based on double Fano resonances. Transfer of the absorbed power between two orthogonal superradiant oscillators is shown to be mediated by the common subradiant oscillator.
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