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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 15 — Jul. 20, 2009
  • pp: 12493–12501

Terahertz near-field enhancement in narrow rectangular apertures on metal film

D. J. Park, S. B. Choi, Y. H. Ahn, F. Rotermund, I. B. Sohn, C. Kang, M. S. Jeong, and D. S. Kim  »View Author Affiliations


Optics Express, Vol. 17, Issue 15, pp. 12493-12501 (2009)
http://dx.doi.org/10.1364/OE.17.012493


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Abstract

We report huge field accumulations in rectangular aperture arrays on thin metal film by using shape resonance in THz frequency region. A huge far-field transmission enhancement is observed in samples of various widths ranging from 10 µm to 1.8 µm which correspond to only an order of λ/100. Theoretical calculations based on vector diffraction theory indicates 230 times near-field enhancement in case of the 1.8 µm wide rectangular aperture. Transmission measurement through the single rectangular aperture shows that the shape resonance, not the periodicity, is mainly responsible for the transmission enhancement and the corresponding field enhancement.

© 2009 Optical Society of America

OCIS Codes
(180.0180) Microscopy : Microscopy
(260.3090) Physical optics : Infrared, far
(320.7160) Ultrafast optics : Ultrafast technology

ToC Category:
Diffraction and Gratings

History
Original Manuscript: April 28, 2009
Revised Manuscript: June 9, 2009
Manuscript Accepted: June 11, 2009
Published: July 8, 2009

Citation
D. J. Park, S. B. Choi, Y. H. Ahn, F. Rotermund, I. B. Sohn, Chul Kang, M. S. Jeong, and D. S. Kim, "Terahertz near-field enhancement in narrow rectangular apertures on metal film," Opt. Express 17, 12493-12501 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-15-12493


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