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  • Received: Aug. 21, 2007

    Accepted: --

    Posted: Oct. 11, 2007

    Published Online: Oct. 11, 2007

    The Author Email: Min Qiu (


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    Ziyang Zhang, Min Qiu, Ulf Andersson, Limin Tong. Subwavelength-diameter silica wire for light in-coupling to silicon-based waveguide[J]. Chinese Optics Letters, 2007, 5(10): 577

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Chinese Optics Letters, Vol. 5, Issue 10, 577 (2007)

Subwavelength-diameter silica wire for light in-coupling to silicon-based waveguide

Ziyang Zhang1, Min Qiu1,*, Ulf Andersson2, and Limin Tong3

Author Affiliations

  • 1Department of Microelectronics and Applied Physics, Royal Institute of Technology (KTH), Electrum 229, 164 40 Kista, Sweden
  • 2Center for Parallel Computers, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
  • 3Department of Optical Engineering, Zhejiang University, Hangzhou 310027


Coupling between subwavelength-diameter silica wires and silicon-based waveguides is studied using the parallel three-dimensional (3D) finite-different time-domain method. Conventional butt-coupling to a silica-substrated silicon wire waveguide gives above 40% transmission at the wavelength range from 1300 to 1750 nm with good robustness against axial misalignments. Slow light can be generated by counter-directional coupling between a silica wire and a two-dimensional (2D) silicon photonic crystal slab waveguide. Through dispersion-band engineering, 82% transmission is achieved over a coupling distance of 50 lattice constants. The group velocity is estimated as 1/35 of the light speed in vacuum.


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