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      Frequency dependent steering with backward leaky waves via photonic crystal interface layer

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      Author
      Colak, E.
      Caglayan, H.
      Cakmak, A. O.
      Villa, A. D.
      Capolino, F.
      Özbay, Ekmel
      Date
      2009
      Source Title
      Optics Express
      Print ISSN
      1094-4087
      Publisher
      Optical Society of America
      Volume
      17
      Issue
      12
      Pages
      9879 - 9890
      Language
      English
      Type
      Article
      Item Usage Stats
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      102
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      Abstract
      A Photonic Crystal (PC) with a surface defect layer (made of dimers) is studied in the microwave regime. The dispersion diagram is obtained with the Plane Wave Expansion Method. The dispersion diagram reveals that the dimer-layer supports a surface mode with negative slope. Two facts are noted: First, a guided (bounded) wave is present, propagating along the surface of the dimer-layer. Second, above the light line, the fast traveling mode couple to the propagating spectra and as a result a directive (narrow beam) radiation with backward characteristics is observed and measured. In this leaky mode regime, symmetrical radiation patterns with respect to the normal to the PC surface are attained. Beam steering is observed and measured in a 70 degrees angular range when frequency ranges in the 11.88-13.69GHz interval. Thus, a PC based surface wave structure that acts as a frequency dependent leaky wave antenna is presented. Angular radiation pattern measurements are in agreement with those obtained via numerical simulations that employ the Finite Difference Time Domain Method (FDTD). Finally, the backward radiation characteristics that in turn suggest the existence of a backward leaky mode in the dimer-layer are experimentally verified using a halved dimer-layer structure. (C) 2009 Optical Society of America
      Keywords
      Subwavelength Aperture
      Transmission
      Light
      Antenna
      Radiation
      Surface
      Superprism
      Permalink
      http://hdl.handle.net/11693/11744
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/OE.17.009879
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      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
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