Abstract
Without losing symmetry, plasmonic Fano resonances have been observed and investigated in multiple nanorod dimers antennae in this paper. The dipole–dipole Fano resonance in three nanorod dimers can be excited simultaneously due to the resonance detuning, and the induced currents of nanorod dimers on both sides are in-phase and out-of-phase with the middle nanorod dimer, respectively. The sharp Fano dip excited in three nanorod dimers antennae can be used to realize the high sensitive sensing of 1116 nm/RIU in the visible and near infrared regions. Furthermore, the Fano resonance is also observed in plasmonic nanoantennae with four nanorod dimers.
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