title: THz surface plasmon modes on planar Goubau lines.
abstract: The dispersion relation and confinement of terahertz surface plasmon modes propagating along planar Goubau lines are studied using guided-wave time domain spectroscopy. We demonstrate the radial nature of the surface plasmon mode known as the Goubau mode and the transverse confinement of the electric field over a few tenths of microns (~l/10). We experimentally and computationally observed a transition of the shape of the THz pulses from unipolar to bipolar as the propagation distance increases, indicating that the Goubau line acts as a high-pass filter. The deviation of the dispersion relation curve from a linear law above 600 GHz is discussed.
authors.affiliation: Institut d’Electronique Fondamentale, UMR8622 CNRS, Univ. Paris Sud, 91405 Orsay, France.
authors.forename: D
authors.initials: D
authors.lastname: Gacemi
authors.forename: J
authors.initials: J
authors.lastname: Mangeney
authors.forename: T
authors.initials: T
authors.lastname: Laurtent
authors.forename: J-F
authors.initials: JF
authors.lastname: Lampin
authors.forename: T
authors.initials: T
authors.lastname: Akalin
authors.forename: K
authors.initials: K
authors.lastname: Blary
authors.forename: A
authors.initials: A
authors.lastname: Degiron
authors.forename: P
authors.initials: P
authors.lastname: Crozat
authors.forename: F
authors.initials: F
authors.lastname: Meng