Two-dimensional and three-dimensional analysis of taper structures for coupling into and out of photonic crystal slab waveguides

Y.-F. Chau, Y.-S. Sun, Din-ping Tsai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


The appropriate technique for coupling light efficiently from the conventional silica waveguide (SWG) entrance and exit of a photonic crystal slab waveguide (PCSWG) in a square lattice of dielectric rods is determined by calculation using the twodimensional (2D) and three-dimensional (3D) finite-difference time-domain method, Four types of taper structure as the interface between SWG and PCSWG have been investigated. Coupling efficiency is found to be highly sensitive to the taper structure, defect rod configuration, and slab thickness. We find that when the type D tapered structure with a pair of larger defect rods, which is more flexible during fabrication, is placed between input/output SWG and PCSWG, if alters the mode properties of the guide mode so that mode matching can be achieved by determining the optimum defect configurations. Also, detailed computations of the 2D device and 3D slab version are given. © 2006 The Japan Society of Applied Physics.
Original languageEnglish
Pages (from-to)7746-7752
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number10 A
Publication statusPublished - 15 Oct 2006
Externally publishedYes


  • Coupling technique
  • Finite-difference time-domain
  • Photonic crystal slab waveguide
  • Taper structure

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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