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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 14 — Jul. 9, 2007
  • pp: 9022–9028

Coupling terahertz radiation onto a metal wire using a subwavelength coaxial aperture

Amit Agrawal and Ajay Nahata  »View Author Affiliations

Optics Express, Vol. 15, Issue 14, pp. 9022-9028 (2007)

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We demonstrate a simple technique for coupling freely propagating broadband THz radiation to multi-cycle THz pulses on a cylindrical metal wire. This is accomplished by inserting the tapered end of a cylindrical wire into the center of a subwavelength circular aperture fabricated in a freestanding metal film, forming an effective coaxial waveguide. By doing so, we convert the transmission properties of THz pulses through the aperture from an evanescent mode to a propagating mode. By fabricating concentric annular grooves about the aperture, multicycle THz pulses are coupled to the wire. The individual groove geometry, number of grooves, and groove spacing surrounding the subwavelength aperture on the metal film determine the shape of THz pulses launched on the waveguide.

© 2007 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(130.2790) Integrated optics : Guided waves
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(260.3090) Physical optics : Infrared, far
(320.7160) Ultrafast optics : Ultrafast technology

ToC Category:
Optics at Surfaces

Original Manuscript: May 21, 2007
Revised Manuscript: June 24, 2007
Manuscript Accepted: July 1, 2007
Published: July 6, 2007

Amit Agrawal and Ajay Nahata, "Coupling terahertz radiation onto a metal wire using a subwavelength coaxial aperture," Opt. Express 15, 9022-9028 (2007)

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