Low Optical Loss Connection for Photonic Crystal Slab Waveguides

Akiko Gomyo, Jun Ushida, Masayuki Shirane, Masatoshi Tokushima, Hirohito Yamada

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Low-loss optical coupling structures between photonic crystal waveguides and channel waveguides were investigated. It was emphasized that impedance matching of guided modes of those waveguides, as well as field-profile matching, was essential to achieving the low-loss optical coupling. We developed an impedance matching theory for Bloch waves, and applied it to designing the low-loss optical coupling structures. It was demonstrated that the optical coupling loss between a photonic crystal waveguide and a Si-channel waveguide was reduced to as low as 0.7 dB by introducing an interface structure for impedance matching between the two waveguides.

Original languageEnglish
Pages (from-to)328-335
Number of pages8
JournalIEICE Transactions on Electronics
Issue number3
Publication statusPublished - 2004 Mar


  • Admittance
  • Immittance of EM Bloch waves
  • Impedance
  • Photonic crystal slab
  • Reflection
  • Transmission
  • Trapezoidal interface structure


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