title: Efficient photonic crystal directional couplers.
abstract: 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.
authors.affiliation: Center for Communications, Optics and Materials, Technical University of Denmark, Building 345V, DK-2800, Kgs. Lyngby, Denmark. mthor@fysik.dtu.dk
authors.forename: Morten
authors.initials: M
authors.lastname: Thorhauge
authors.forename: Lars H
authors.initials: LH
authors.lastname: Frandsen
authors.forename: Peter I
authors.initials: PI
authors.lastname: Borel