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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: G. I. Stegeman
  • Vol. 23, Iss. 3 — Mar. 1, 2006
  • pp: 419–422

Beaming of electromagnetic waves emitted through a subwavelength annular aperture

Humeyra Caglayan, Irfan Bulu, and Ekmel Ozbay  »View Author Affiliations


JOSA B, Vol. 23, Issue 3, pp. 419-422 (2006)
http://dx.doi.org/10.1364/JOSAB.23.000419


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Abstract

We study the diffraction of electromagnetic waves from subwavelength metallic circular apertures in the microwave spectrum. The theoretical and experimental demonstration of the near- and far-field electromagnetic distributions for subwavelength circular annular apertures and circular annular apertures surrounded by concentric periodic grooves are reported here. The metallic samples had a subwavelength hole with a diameter of 8 mm and had concentric grooves with a periodicity of 16 mm. We present the angular transmission distributions from circular annular apertures, and circular annular apertures surrounded by concentric periodic grooves. At the surface-mode resonance frequency the transmitted electromagnetic waves from the subwavelength circular annular aperture surrounded by concentric periodic grooves have a strong angular confinement with an angular divergence of ± 3 ° . This represents a fourfold reduction when compared with the angular divergence of the beam transmitted from the subwavelength circular aperture.

© 2006 Optical Society of America

OCIS Codes
(230.1950) Optical devices : Diffraction gratings
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Metamaterials

History
Original Manuscript: July 5, 2005
Manuscript Accepted: August 21, 2005

Citation
Humeyra Caglayan, Irfan Bulu, and Ekmel Ozbay, "Beaming of electromagnetic waves emitted through a subwavelength annular aperture," J. Opt. Soc. Am. B 23, 419-422 (2006)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-23-3-419

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