We demonstrate highly efficient and spectrally flat broadband coupling in photonic crystal directional couplers. The result is obtained by use of a novel design with smaller holes between coparallel photonic crystal waveguides for efficient channel-to-channel coupling. The system studied is based on a planar hexagonal photonic crystal lattice of holes made in silicon-on-insulator material. Results from three-dimensional finite-difference time domain modeling are shown to closely match results measured on fabricated samples.
© 2003 Optical Society of America
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.4510) Fiber optics and optical communications : Optical communications
(130.1750) Integrated optics : Components
(130.2790) Integrated optics : Guided waves
Morten Thorhauge, Lars H. Frandsen, and Peter I. Borel, "Efficient photonic crystal directional couplers," Opt. Lett. 28, 1525-1527 (2003)