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THz surface plasmon modes on planar Goubau lines.

D Gacemi1, J Mangeney, T Laurtent

  • 1Institut d’Electronique Fondamentale, UMR8622 CNRS, Univ. Paris Sud, 91405 Orsay, France.

Optics Express
|April 20, 2012
PubMed
Summary

This study explores terahertz surface plasmon modes on Goubau lines. Results show these lines act as high-pass filters, affecting terahertz pulse shapes during propagation.

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Area of Science:

  • Physics
  • Electromagnetism
  • Materials Science

Background:

  • Surface plasmon modes offer unique electromagnetic wave propagation characteristics.
  • Goubau lines provide a platform for guiding these modes at terahertz frequencies.
  • Understanding mode confinement and dispersion is crucial for device applications.

Purpose of the Study:

  • To investigate the dispersion relation and confinement properties of terahertz surface plasmon modes on planar Goubau lines.
  • To analyze the behavior of terahertz pulses propagating along these lines.
  • To characterize the Goubau line as a potential optical component.

Main Methods:

  • Guided-wave time domain spectroscopy was employed for experimental analysis.
  • Computational methods were used to model and verify experimental observations.
  • Analysis focused on the radial nature of the Goubau mode and electric field confinement.

Main Results:

  • The radial nature of the Goubau mode was demonstrated.
  • Transverse electric field confinement was observed within tenths of microns (~λ/10).
  • A transition from unipolar to bipolar terahertz pulse shapes indicated high-pass filtering behavior.
  • Deviation from linear dispersion above 600 GHz was observed and discussed.

Conclusions:

  • Planar Goubau lines effectively support and confine terahertz surface plasmon modes.
  • The Goubau line exhibits high-pass filtering characteristics, altering terahertz pulse dynamics.
  • The observed dispersion relation deviations provide insights for terahertz wave manipulation.