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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 18 — Sep. 5, 2005
  • pp: 7028–7034

Coupling of terahertz pulses onto a single metal wire waveguide using milled grooves

Hua Cao and Ajay Nahata  »View Author Affiliations


Optics Express, Vol. 13, Issue 18, pp. 7028-7034 (2005)
http://dx.doi.org/10.1364/OPEX.13.007028


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Abstract

We demonstrate a novel approach for coupling freely propagating THz pulses onto a metal wire waveguide utilizing grooves fabricated directly into the metal. Using broadband THz pulses incident on the wire, we use metal segments containing zero, one, three, and eight uniformly spaced grooves to launch surface propagating multi-cycle pulses along the wire. We observe a one-to-one correspondence between the groove number and the number of oscillations in the THz waveform radiated from the end of the waveguide. We further demonstrate that this coupled radiation is radially polarized. Although the cross-sectional parameters of the grooves are identical in the present measurements, alteration of the individual grooves in a controlled manner should allow for arbitrarily shaped THz pulses to be launched on the waveguide.

© 2005 Optical Society of America

OCIS Codes
(230.7370) Optical devices : Waveguides
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(260.3090) Physical optics : Infrared, far
(320.5550) Ultrafast optics : Pulses

ToC Category:
Research Papers

History
Original Manuscript: July 27, 2005
Revised Manuscript: August 25, 2005
Published: September 5, 2005

Citation
Hua Cao and Ajay Nahata, "Coupling of terahertz pulses onto a single metal wire waveguide using milled grooves," Opt. Express 13, 7028-7034 (2005)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-13-18-7028


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