title: Highly localized discrete quadratic solitons.
abstract: We observe highly localized solitons in periodically poled lithium niobate waveguide arrays close to phase matching for second-harmonic generation. With fundamental and second-harmonic input in one channel the response indicates two distinguishable propagation schemes. Depending on the relative phase between the two input waves, a self-trapped beam emerges, resembling closely either the in- or the out-of-phase quadratic eigenmode of a single waveguide. A stable soliton propagates when the input waves are in phase.
authors.affiliation: Center for Research and Education in Optics and Lasers and Florida Photonics Center of Excellence, College of Optics, University of Central Florida, 4000 Central Florida Boulevard, Orlando, Florida 32816, USA. iwanow@creol.ucf.edu
authors.forename: Robert
authors.initials: R
authors.lastname: Iwanow
authors.forename: George I
authors.initials: GI
authors.lastname: Stegeman
authors.forename: Roland
authors.initials: R
authors.lastname: Schiek
authors.forename: Thomas
authors.initials: T
authors.lastname: Pertsch
authors.forename: Falk
authors.initials: F
authors.lastname: Lederer
authors.forename: Yoohong
authors.initials: Y
authors.lastname: Min
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Sohler