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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 20 — Sep. 28, 2009
  • pp: 17412–17425

Influence of the dielectric substrate on the terahertz electric near-field of a hole in a metal

L. Guestin, A. J. L. Adam, J. R. Knab, M. Nagel, and P. C. M. Planken  »View Author Affiliations

Optics Express, Vol. 17, Issue 20, pp. 17412-17425 (2009)

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We have studied theoretically and experimentally the influence of a dielectric substrate on the frequency-dependent terahertz electric near-field of a small hole in a metal layer. We find that the near-field transmission spectrum and the two-dimensional field distribution of an empty hole in a thin metal layer on a substrate are almost identical to that of a hole which is also filled with the same dielectric material as the substrate. For thicker metal layers, however, the near-field spectra of filled and unfilled holes become very different. In addition, for thick metal layers, the two-dimensional field distributions are more strongly affected by the substrate, especially if we allow for an air gap between the metal and the substrate. Our results validate the -somewhat unusual- two-dimensional field distribution measured beneath a hole in a thick metal foil and highlight the effect that a substrate can have on the measurement of the near-field of an object.

© 2009 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(050.6624) Diffraction and gratings : Subwavelength structures
(110.6795) Imaging systems : Terahertz imaging

ToC Category:

Original Manuscript: July 23, 2009
Revised Manuscript: September 11, 2009
Manuscript Accepted: September 11, 2009
Published: September 15, 2009

L. Guestin, A. J. L. Adam, J. R. Knab, M. Nagel, and P. C. M. Planken, "Influence of the dielectric substrate on the terahertz electric near-field of a hole in a metal," Opt. Express 17, 17412-17425 (2009)

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