Transverse Plasmon Resonances of Aluminium Circular Wire and Tube

Abstract

We investigate the plasmon resonances in the scattering and absorption of the TE-polarized light by the solid aluminium wires and tubes of circular cross-section with diameters from nanometers to microns. In the case of tube we keep its thickness at the nanoscale however thick enough to allow using the classical electromagnetics analysis. Here, analytical solution of the scattering problem is applied. To characterize the aluminium complex dielectric permittivity function in the visible range, we use experimental data. Our results show that aluminium wires and nanothin tubes display intensive plasmon resonances in the scattering in the deep ultra-violet range if their radius is less than 50 nm however less bright multipole resonances can be seen even if it is as large as 2 µm.