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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 6 — Mar. 22, 2004
  • pp: 1004–1010

Resonantly enhanced transmission of terahertz radiation through a periodic array of subwavelength apertures

Hua Cao and Ajay Nahata  »View Author Affiliations

Optics Express, Vol. 12, Issue 6, pp. 1004-1010 (2004)

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We demonstrate resonantly enhanced transmission of freely propagating coherent terahertz radiation through free-standing metal foils perforated with periodic arrays of sub-wavelength apertures. These arrays consist of 400 µm diameter apertures periodically spaced by 1 mm and 600 µm diameter apertures periodically spaced by 1.5 mm. We measure absolute amplitude transmission coefficients of ~0.6 at the resonance wavelength. Correspondingly, the ratio of the absolute amplitude transmission coefficient to the fractional aperture area at these resonance frequencies is ~5. This value at terahertz frequencies is significantly larger than equivalent values measured at optical frequencies.

© 2004 Optical Society of America

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

ToC Category:
Research Papers

Original Manuscript: February 12, 2004
Revised Manuscript: March 5, 2004
Published: March 22, 2004

Hua Cao and Ajay Nahata, "Resonantly enhanced transmission of terahertz radiation through a periodic array of subwavelength apertures," Opt. Express 12, 1004-1010 (2004)

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Fig. 1. Fig. 2. Fig. 3.

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