Tunable phaselike resonance in split coaxial gold nanotube resonator pair

We propose the split coaxial nanotube resonator pair and investigate its plasmon resonance properties theoretically. It is found that the resonance peak splits and forms more dips with the increase of the number of slits in the structure. We present that the splitting behaviors result from the phaselike resonance of adjacent tubes. In addition, it shows the optical transmission peaks can shift and attenuate by tuning the split width, the thickness and dielectric constant of the medium layer between two coaxial nanotubes. The instantaneous electric field distributions show that symmetry and antisymmetry quadrupole modes exist in these structures.