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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 19 — Sep. 18, 2006
  • pp: 8772–8778

Frequency-dependent radiation patterns emitted by THz plasmons on finite length cylindrical metal wires

Jason A. Deibel, Nicholas Berndsen, Kanglin Wang, Daniel M. Mittleman, Nick C. J. van der Valk, and Paul C. M. Planken  »View Author Affiliations

Optics Express, Vol. 14, Issue 19, pp. 8772-8778 (2006)

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We report on the emission patterns from THz plasmons propagating towards the end of cylindrical metal waveguides. Such waveguides exhibit low loss and dispersion, but little is known about the dynamics of the terahertz radiation at the end of the waveguide, specifically in the near- and intermediate-field. Our experimental results and numerical simulations show that the near- and intermediate-field terahertz spectra, measured at the end of the waveguide, vary with the position relative to the waveguide. This is explained by the frequency-dependent diffraction occurring at the end of the cylindrical waveguide. Our results show that near-field changes in the frequency content of THz pulses for increasing wire-detector distances must be taken into account when studying surface waves on cylindrical waveguides.

© 2006 Optical Society of America

OCIS Codes
(230.7370) Optical devices : Waveguides
(240.6680) Optics at surfaces : Surface plasmons
(260.3090) Physical optics : Infrared, far

ToC Category:
Optics at Surfaces

Original Manuscript: August 16, 2006
Revised Manuscript: September 5, 2006
Manuscript Accepted: September 5, 2006
Published: September 18, 2006

Jason A. Deibel, Nicholas Berndsen, Kanglin Wang, Daniel M. Mittleman, Nick C. van der Valk, and Paul C. M. Planken, "Frequency-dependent radiation patterns emitted by THz plasmons on finite length cylindrical metal wires," Opt. Express 14, 8772-8778 (2006)

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