title: Second-order coupling in femtosecond-laser-written waveguide arrays.
abstract: We investigate the influence of second-order coupling in femtosecond-laser-written zigzag waveguide arrays, where the ratio Delta between second- and first-order coupling constants is adjusted from Delta=0.0 to Delta=2.8. Propagation patterns are observed directly via color center fluorescence.
authors.affiliation: Institute of Applied Physics, Friedrich-Schiller-University Jena, Jena, Germany. f.dreisow@uni-jena.de
authors.forename: Felix
authors.initials: F
authors.lastname: Dreisow
authors.forename: Alexander
authors.initials: A
authors.lastname: Szameit
authors.forename: Matthias
authors.initials: M
authors.lastname: Heinrich
authors.forename: Thomas
authors.initials: T
authors.lastname: Pertsch
authors.forename: Stefan
authors.initials: S
authors.lastname: Nolte
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann