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      Multiple slow waves and relevant transverse transmission and confinement in chirped photonic crystals

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      Author
      Serebryannikov, A. E.
      Cakmak, A. O.
      Colak, E.
      Caglayan, H.
      Kurt, H.
      Özbay, Ekmel
      Date
      2014-09-02
      Source Title
      Optics Express
      Print ISSN
      1094-4087
      Publisher
      OSA Publishing
      Volume
      22
      Issue
      18
      Pages
      21806 - 21819
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      The dispersion properties of rod-type chirped photonic crystals (PhCs) and non-channeled transmission in the direction of the variation of structural parameters from one cell of such a PhC to another are studied. Two types of configurations that enable multiple slow waves but differ in the utilized chirping scheme are compared. It is demonstrated that the multiple, nearly flat bands with a group index of refraction exceeding 180 can be obtained. For these bands, transmission is characterized by multiple narrow peaks of perfect transmission, strong field enhancement inside the slab, and large values of the Q-factor. Among the bands, there are some that show negative phase velocity. Symmetry with respect to the slab mid-plane must be kept in order to obtain constructive interferences that are necessary for reflection-free transmission. It is shown that 15 and more slow wave bands can be obtained in one configuration. The corresponding transmission peaks are well separated from each other, being the only significant feature of the transmission spectrum, while the Q-factor can exceed 105. The observed features are preserved in a wide range of the incidence angle variation. They can be used for tuning the locations and spectral widths of the transmission peaks. Some comparisons with the chirped multilayer structures have been carried out. ©2014 Optical Society of America.
      Keywords
      Chirped Photonic Crystals
      Slow Wave
      Permalink
      http://hdl.handle.net/11693/12449
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/OE.22.021806
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      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
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