摘要
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 counterdirectional 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.
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 counterdirectional 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.
基金
This work was supported by the Swedish Foundation for Strategic Research (SSF) through the INGVAR Program,the SSF Strategic Research Center in Photonics,and the Swedish Research Council (VR).
