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      Beaming of electromagnetic waves emitted through a subwavelength annular aperture

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      Author(s)
      Caglayan, H.
      Bulu, I.
      Özbay, Ekmel
      Date
      2006
      Source Title
      Journal of the Optical Society of America B: Optical Physics
      Print ISSN
      0740-3224
      Publisher
      Optical Society of American (OSA)
      Volume
      23
      Issue
      3
      Pages
      419 - 422
      Language
      English
      Type
      Article
      Item Usage Stats
      212
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      217
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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.
      Keywords
      Electromagnetic wave diffraction
      Electromagnetic wave emission
      Electromagnetic wave transmission
      Microwave spectroscopy
      Angular transmission distributions
      Far-field electromagnetic distributions
      Microwave spectrum
      Near-field electromagnetic distributions
      Electromagnetic waves
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      http://hdl.handle.net/11693/23879
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/JOSAB.23.000419
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Nanotechnology Research Center (NANOTAM) 1179
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