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      Diffraction inspired unidirectional and bidirectional beam splitting in defect-containing photonic structures without interface corrugations

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      Author(s)
      Colak, E.
      Serebryannikov, A. E.
      Usik, P. V.
      Özbay, Ekmel
      Date
      2016
      Source Title
      Journal of Applied Physics
      Print ISSN
      0021-8979
      Publisher
      American Institute of Physics Inc.
      Volume
      119
      Issue
      19
      Pages
      10 - 1
      Language
      English
      Type
      Article
      Item Usage Stats
      219
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      233
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      Abstract
      It is shown that strong diffractions and related dual-beam splitting can be obtained at transmission through the nonsymmetric structures that represent two slabs of photonic crystal (PhC) separated by a single coupled-cavity type defect layer, while there are no grating-like corrugations at the interfaces. The basic operation regimes include unidirectional and bidirectional splitting that occur due to the dominant contribution of the first positive and first negative diffraction orders to the transmission, which is typically connected with different manifestations of the asymmetric transmission phenomenon. Being the main component of the resulting transmission mechanism, diffractions appear owing to the effect exerted by the defect layer that works like an embedded diffractive element. Two mechanisms can co-exist in one structure, which differ, among others, in that whether dispersion allows coupling of zero order to a wave propagating in the regular, i.e., defect-free PhC segments or not. The possibility of strong diffractions and efficient splitting related to it strongly depend on the dispersion properties of the Floquet-Bloch modes of the PhC. Existence of one of the studied transmission scenarios is not affected by location of the defect layer.
      Keywords
      Diffraction
      Dispersion (waves)
      Asymmetric transmissions
      Diffraction orders
      Diffractive element
      Dispersion properties
      Dominant contributions
      Floquet-Bloch mode
      Photonic structure
      Transmission mechanisms
      Defects
      Permalink
      http://hdl.handle.net/11693/36654
      Published Version (Please cite this version)
      http://dx.doi.org/10.1063/1.4949509
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      • Nanotechnology Research Center (NANOTAM) 1179
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