title: Dispersion of surface plasmon polaritons on metal wires in the terahertz frequency range.
abstract: We report the experimental and theoretical study of the dispersive behavior of surface plasmon polaritons (SPPs) on cylindrical metal surfaces in the terahertz frequency range. Time-domain measurements of terahertz SPPs propagating on metal wires reveal a unique structure that is inconsistent with a simple extrapolation of the high frequency portion of the dispersion diagram for SPPs on a planar metal surface, and also distinct from that of SPPs on metal nanowires observed at visible and near-infrared frequencies. The results are consistent with a numerical solution of Maxwell's equations, showing that the dispersive behavior of SPPs on a cylindrical metal surface at terahertz frequencies is quite different from that of SPPs on a flat surface. These findings indicate the increasing importance of skin effects for SPPs in the terahertz range, as well as the enhancement of such effects on curved surfaces.
authors.affiliation: Rice University, Department of Electrical and Computer Engineering, MS 366, Houston, Texas 77251-1892, USA.
authors.forename: Kanglin
authors.initials: K
authors.lastname: Wang
authors.forename: Daniel M
authors.initials: DM
authors.lastname: Mittleman