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      • Department of Electrical and Electronics Engineering
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      Theoretical and experimental investigations of asymmetric light transport in graded index photonic crystal waveguides

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      Author(s)
      Giden, I. H.
      Yilmaz, D.
      Turduev, M.
      Kurt, H.
      Colak, E.
      Özbay, Ekmel
      Date
      2014
      Source Title
      Applied Physics Letters
      Print ISSN
      0003-6951
      Publisher
      AIP Publishing
      Volume
      104
      Issue
      3
      Pages
      03116-1 - 03116-5
      Language
      English
      Type
      Article
      Item Usage Stats
      218
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      Abstract
      To provide asymmetric propagation of light, we propose a graded index photonic crystal (GRIN PC) based waveguide configuration that is formed by introducing line and point defects as well as intentional perturbations inside the structure. The designed system utilizes isotropic materials and is purely reciprocal, linear, and time-independent, since neither magneto-optical materials are used nor time-reversal symmetry is broken. The numerical results show that the proposed scheme based on the spatial-inversion symmetry breaking has different forward (with a peak value of 49.8%) and backward transmissions (4.11% at most) as well as relatively small round-trip transmission (at most 7.11%) in a large operational bandwidth of 52.6 nm. The signal contrast ratio of the designed configuration is above 0.80 in the telecom wavelengths of 1523.5-1576.1 nm. An experimental measurement is also conducted in the microwave regime: A strong asymmetric propagation characteristic is observed within the frequency interval of 12.8 GHz-13.3 GHz. The numerical and experimental results confirm the asymmetric transmission behavior of the proposed GRIN PC waveguide. (C) 2014 AIP Publishing LLC.
      Keywords
      Diode
      Permalink
      http://hdl.handle.net/11693/13116
      Published Version (Please cite this version)
      http://dx.doi.org/10.1063/1.4861926
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      • Department of Electrical and Electronics Engineering 4011
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