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Active and Passive Electronic Components
Volume 2007, Article ID 78602, 5 pages
Research Article

Subwavelength-Diameter Silica Wire and Photonic Crystal Waveguide Slow Light Coupling

1Department of Microelectronics and Applied Physics, Royal Institute of Technology (KTH), Electrum 229, Kista 164 40, Sweden
2Center for Parallel Computers, Royal Institute of Technology (KTH), Stockholm 100 44, Sweden

Received 28 August 2007; Accepted 21 October 2007

Academic Editor: Yalin Lu

Copyright © 2007 Ziyang Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Counter-directional coupling between subwavelength-diameter silica wire and single-line-defect two-dimensional photonic crystal slab waveguide is studied numerically using parallel three-dimensional finite-different time-domain method. By modifying silica wire properties or engineering photonic crystal waveguide dispersion band, the coupling central wavelength can be moved to the slow light region and the coupling efficiency improves simultaneously. One design gives 82% peak power transmission from silica wire to photonic crystal waveguide over an interacting distance of 50 lattice constants. The group velocity is estimated as 1/35 of light speed in vacuum.