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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 12 — Jun. 12, 2006
  • pp: 5671–5681

Surface electromagnetic wave excitation and diffraction by subwavelength slit with periodically patterned metallic grooves

Changtao Wang, Chunlei Du, Yueguang Lv, and Xiangang Luo  »View Author Affiliations

Optics Express, Vol. 14, Issue 12, pp. 5671-5681 (2006)

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Based on the theoretical formalism derived from the diffraction theory and electromagnetic boundary condition (Phys. Rev. Lett. 167401(2003)), we investigate numerically the diffraction behavior of light passing through a subwavelength metallic slit-grooves structure, slit surrounded symmetrically by a finite array of grooves at the output surface. The diffraction dependence with the geometrical parameters, groove depth, width and number is analyzed in detail. It is found that variant profile of angle spectra and beaming intensity can be obtained in the far field by tuning the geometrical parameters. Numerical analysis shows that these diffraction behaviors are associated with different excitation states of surface electromagnetic wave.

© 2006 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(230.7380) Optical devices : Waveguides, channeled
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

Original Manuscript: March 16, 2006
Revised Manuscript: May 9, 2006
Manuscript Accepted: May 10, 2006
Published: June 12, 2006

Changtao Wang, Chunlei Du, Yueguang Lv, and Xiangang Luo, "Surface electromagnetic wave excitation and diffraction by subwavelength slit with periodically patterned metallic grooves," Opt. Express 14, 5671-5681 (2006)

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  1. H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, F. Martín-Moreno, L. J. García-Vidal, and T. W. Ebbesen, "Beaming light from a subwavelength aperture," Science 297, 820 (2002). [CrossRef] [PubMed]
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  9. The approximation of fails when a=b. You should refer to the original integral definition in Ref. 3. Here we do the calculation by the method of Montecarlo.

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