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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 8 — Apr. 9, 2012
  • pp: 8466–8471

THz surface plasmon modes on planar Goubau lines

D. Gacemi, J. Mangeney, T. Laurtent, J.-F. Lampin, T. Akalin, K. Blary, A. Degiron, P. Crozat, and F. Meng  »View Author Affiliations

Optics Express, Vol. 20, Issue 8, pp. 8466-8471 (2012)

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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.

© 2012 OSA

OCIS Codes
(230.7370) Optical devices : Waveguides
(240.6680) Optics at surfaces : Surface plasmons
(320.5390) Ultrafast optics : Picosecond phenomena

ToC Category:
Optics at Surfaces

Original Manuscript: January 30, 2012
Revised Manuscript: March 22, 2012
Manuscript Accepted: March 22, 2012
Published: March 27, 2012

D. Gacemi, J. Mangeney, T. Laurtent, J.-F. Lampin, T. Akalin, K. Blary, A. Degiron, P. Crozat, and F. Meng, "THz surface plasmon modes on planar Goubau lines," Opt. Express 20, 8466-8471 (2012)

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