Abstract
We numerically investigated the magnetic plasmon resonances in the double-rod and tri-rod structures (DRSs and TRSs) for sensing applications. Like localized surface plasmon modes in nanostructures, the magnetic plasmon resonance wavelengths are sensitive to refractive index changes in the environment medium. The electromagnetic fields near DRSs and TRSs were much more localized in the dielectric surrounding the structures at the resonance wavelengths, which caused the linewidth of magnetic responses narrower. A large figure of merit could be obtained in the magnetic plasmon modes of DRSs and TRSs, which enables the use of the structures as sensing elements with remarkable performance.
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