Dispersion relations of plasmon wave in metallic nanowires

The dispersion relations of 0th transverse-magnetic (TM) mode plasmon wave propagating along silver nanowires are calculated. Based on these relations, the propagation loss, phase velocity, and group velocity of the plasmon wave are extracted to study the effects of nanowire diameter and surrounding dielectric medium. Several useful inferences for the design of an optical waveguide in nanometer scales are drawn from these results. The dispersion relations of high-order hybrid modes of metallic nanowires are being investigated at the present stage. This study will be useful for the design of nanometer-scaled metallic waveguides.