title: Observation of discrete gap solitons in binary waveguide arrays.
abstract: We report an experimental study of discrete gap solitons in binary arrays of optical waveguides. We observe self-focusing indicating soliton generation when the inclination angle of an input beam is slightly above the Bragg angle and show that the propagation direction of the emerging gap soliton is influenced by the effect of interband momentum exchange.
authors.affiliation: Institute National de la Recherche Scientifique, Université du Quebec, Varennes, Quebec J3X 1S2, Canada.
authors.forename: Roberto
authors.initials: R
authors.lastname: Morandotti
authors.forename: Daniel
authors.initials: D
authors.lastname: Mandelik
authors.forename: Yaron
authors.initials: Y
authors.lastname: Silberberg
authors.forename: J Stewart
authors.initials: JS
authors.lastname: Aitchison
authors.forename: Marc
authors.initials: M
authors.lastname: Sorel
authors.forename: Demetrios N
authors.initials: DN
authors.lastname: Christodoulides
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Sukhorukov
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar