Abstract
We propose the coaxial gold nanotubes for their transmission and plasmon resonances theoretically. We find that the transmission spectra are highly adjustable by tuning the thickness of the nanotubes, the separation and the dielectric constant between the inner and outer nanotubes. The resonance peaks close to the left forbidden band gap edge are strongly correlated with the dielectric constant, the inner and outer tube thickness, and the separation between the two tubes. Based on the localized nature of the electric field distributions, we show that local plasmon resonance modes result from hybridized resonances of multifold multipolar plasmon polaritons in the cross section of the coaxial nanotubes.
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