title: Negative coupling between defects in waveguide arrays.
abstract: We report on the experimental demonstration of negative coupling constants between defect guides in a waveguide lattice. We find that coupling can only be negative if the defects are negative and an odd number of lattice sites is between the defect guides.
authors.affiliation: Institute of Applied Physics, Friedrich-Schiller-Universität, Jena, Germany.
authors.forename: J M
authors.initials: JM
authors.lastname: Zeuner
authors.forename: M C
authors.initials: MC
authors.lastname: Rechtsman
authors.forename: R
authors.initials: R
authors.lastname: Keil
authors.forename: F
authors.initials: F
authors.lastname: Dreisow
authors.forename: A
authors.initials: A
authors.lastname: Tünnermann
authors.forename: S
authors.initials: S
authors.lastname: Nolte
authors.forename: A
authors.initials: A
authors.lastname: Szameit