Abstract
We introduce a plasmonic oligomer that supports two quasi-dark modes. A double plasmon-induced transparency spectrum arises from the Fano interference between a bright mode and two quasi-dark modes. A coupling Lorentzian oscillator model is employed to explain the resulting line shape. It is found that the modulation depths and frequency of two Fano resonances can be tuned effectively by displacement of each component of the oligomer. The oligomer can be used as a sensitive plasmon ruler based on both frequency shift and radiance sensing. Furthermore, an artificial magnetic quadrupole is also introduced by one of the quasi-dark modes. We expect that the oligomer will be valuable for the design of plasmonic circuits and multiwavelength surface-enhanced Raman scattering.
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