  By embedding four-rod resonators inside double-split ring resonators
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 four-level tripod atomic system, the transmission
spectrum of the composite metamaterial exhibits a double Fano-based coherent
effect. Transfer of absorbed power between two superradiant oscillators is
controlled by manipulating two coupling strengths conjugated through the
polarization angle of a normally incident electromagnetic wave.
