High efficiency of graded index photonic crystal as an input coupler

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Cakmak A. O., Colak E., Caglayan H., Kurt H., Ozbay E.

JOURNAL OF APPLIED PHYSICS, vol.105, no.10, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 105 Issue: 10
  • Publication Date: 2009
  • Doi Number: 10.1063/1.3130403
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Abdullah Gül University Affiliated: No


A graded index photonic crystal (GRIN PC) configuration was placed at the input side of a photonic crystal waveguide (PCW) in order to efficiently couple the light waves into the waveguide. We compared the transmission efficiencies of light in the absence and presence of the GRIN PC structure. We report a significant improvement in coupling when the GRIN PC is incorporated with the PCW. The intensity profiles were obtained by carrying out the experiments at microwave frequencies. Finite difference time domain based simulations were found to be in good agreement with our experimental results.