Resonance scattering and absorption of light by a silver tube of large diameter and nanoscale thickness

摘要

We investigate the resonances in the scattering and absorption of the TE-polarized light by a silver tube of larger than the wavelength radius and nanoscale thickness. Our instrument is the rigorous analytical solution to the plane-wave scattering problem and experimental data of Johnson and Christy for the silver complex permittivity in the visible range. We find that the resonances are well observed at all wavelengths in the visible and infra-red ranges even if the tube circumference is measured in dozens of microns. They can be explained as the resonances on the standing surface-plasmon-polariton wave running along a curved metal layer. Besides of that, they keep correspondence to different azimuth orders of the localized surface plasmon modes of circular tube. This demonstration helps bridge the gap between localized and delocalized plasmons: one can clearly see that these two effects are two different manifestations of the same physical effect intrinsic for metals in the visible range.