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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 25 — Dec. 16, 2013
  • pp: 30895–30902

Transmission bleaching and coupling crossover in a split tapered aperture

Shuchang Liu, Oleg Mitrofanov, and Ajay Nahata  »View Author Affiliations

Optics Express, Vol. 21, Issue 25, pp. 30895-30902 (2013)

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We investigate the spectral transmission properties of conically tapered metallic apertures made in a split metallic plate using terahertz (THz) time-domain spectroscopy. The introduction of even a small gap between the two halves of the plate results in spectral broadening of the transmitted radiation due to a reduction of the cut-off effect. We find that the resulting transmission spectrum can be described as a weighted sum of the spectra associated with a tapered aperture and a parallel plate waveguide, with the gap spacing controlling the relative ratio. We further find that the field concentration properties of the aperture in a split plate are limited by the radiation leakage through the gap and propose a tapered shell structure to realize strong broadband field concentration. Using numerical simulations, we validate these observations and yield insight into the mode properties within the split tapered aperture.

© 2013 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(240.6680) Optics at surfaces : Surface plasmons
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Diffraction and Gratings

Original Manuscript: October 14, 2013
Revised Manuscript: November 21, 2013
Manuscript Accepted: December 2, 2013
Published: December 6, 2013

Shuchang Liu, Oleg Mitrofanov, and Ajay Nahata, "Transmission bleaching and coupling crossover in a split tapered aperture," Opt. Express 21, 30895-30902 (2013)

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