Dielectric Tensor of a Metal Nanowire with an Elliptical Cross Section

Abstract

The influence of the cross-section geometry of metal nanowires on the dielectric tensor has been examined. Diagonal and off-diagonal components of the dielectric tensor were calculated taking the size dependence of the Fermi energy into account within the free-electron model using the boundary-shape perturbation method. The effect of variation of the eccentricity of the cross section, the effective radius, and the composition of nanowires on frequency dependences of the real and imaginary parts of components of the dielectric tensor was studied. Calculations were performed for Ag, Cu, and Al.