Open AccessTHz surface plasmon modes on planar Goubau lines
Author(s) -
Djamal Gacemi,
J. Mangeney,
T. Laurtent,
JeanFrançois Lampin,
T. Akalin,
K. Blary,
A. Degiron,
P. Crozat,
Fanqi Meng
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.008466
Subject(s) - optics , surface plasmon , surface plasmon polariton , terahertz radiation , planar , dispersion (optics) , dispersion relation , materials science , electric field , plasmon , surface wave , transverse plane , physics , computer graphics (images) , quantum mechanics , computer science , structural engineering , engineering
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.