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      Plasmonic structures with extraordinary transmission and highly directional beaming properties

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      Author
      Cağlayan, H.
      Bulu, I.
      Özbay, Ekmel
      Date
      2006
      Source Title
      Microwave and Optical Technology Letters
      Print ISSN
      0895-2477
      Publisher
      Wiley Periodicals
      Volume
      48
      Issue
      12
      Pages
      2491 - 2496
      Language
      English
      Type
      Article
      Item Usage Stats
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      205
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      Abstract
      We studied the grating-coupling phenomena between surface plasmons and electromagnetic waves in the microwave spectrum. We first present the experimental and theoretical results of an enhanced microwave transmission though a subwavelength circular annular aperture with and without metallic gratings. We demonstrate that a 145-fold enhancement factor could be obtained with a subwavelength circular annular aperture that was surrounded by periodic metallic gratings. This was assisted by the guided mode of the coaxial waveguide and by coupling to the surface plasmons. 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°. We demonstrate that only the output surface is responsible for the beaming effect. Furthermore, we present the field distributions and showed that there is no beaming effect at the off-resonance frequency. © 2006 Wiley Periodicals, Inc.
      Keywords
      Annular aperture
      Beaming
      Enhanced transmission
      Grating
      Subwavelength aperture
      Surface plasmon
      Diffraction gratings
      Electromagnetic wave transmission
      Electromagnetic waves
      Microwaves
      Annular aperture
      Beaming
      Enhanced transmission
      Subwavelength aperture
      Surface plasmon resonance
      Permalink
      http://hdl.handle.net/11693/27159
      Published Version (Please cite this version)
      http://dx.doi.org/10.1002/mop.22015
      Collections
      • Department of Electrical and Electronics Engineering 3619
      • Department of Physics 2358
      • Institute of Materials Science and Nanotechnology (UNAM) 1868
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