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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 2 — Jan. 15, 2013
  • pp: 166–168

Phase-shift anomaly caused by subwavelength-scale metal slit or aperture diffraction

Kanghee Lee, Minwoo Yi, Sang Eon Park, and Jaewook Ahn  »View Author Affiliations

Optics Letters, Vol. 38, Issue 2, pp. 166-168 (2013)

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Terahertz time-domain spectroscopy probes anomalous phase-shift caused by wave diffraction from a subwavelength-scale metal slit or aperture. Carrier frequency phase measurements in the far-field region reveals that nearly 30° phase advance is induced from a subwavelength slit diffraction and that 180° phase-advance from a subwavelength aperture. These results indicate that the conventional 90° phase advance of diffracted waves in the far-field region, known as the Gouy phase shift, is not valid for subwavelength diffraction phenomena. The physical origin of these phase-shift anomalies is attributed to induced electric currents or magnetic dipole radiation, and theoretical analyses based on these factors are in good agreement with the experimental results.

© 2013 Optical Society of America

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(050.5080) Diffraction and gratings : Phase shift
(300.6495) Spectroscopy : Spectroscopy, teraherz
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Ultrafast Optics

Original Manuscript: November 5, 2012
Revised Manuscript: December 3, 2012
Manuscript Accepted: December 7, 2012
Published: January 9, 2013

Kanghee Lee, Minwoo Yi, Sang Eon Park, and Jaewook Ahn, "Phase-shift anomaly caused by subwavelength-scale metal slit or aperture diffraction," Opt. Lett. 38, 166-168 (2013)

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

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