title: Spatial optical simultons in nonlinearly coupled planar waveguides.
abstract: With second-harmonic generation in surface and buried planar waveguides achieved by direct and reverse proton exchange in lithium niobate, we demonstrate a novel kind of quadratic spatial simulton: The transverse-electric fundamental input and the transverse-magnetic second-harmonic waves nonlinearly couple two superimposed planar waveguides, permitting transverse localization of light at room temperature and at excitations as low as 340 nJ in 20-ps pulses.
authors.affiliation: NOOEL--Nonlinear Optics and OptoElectronics Laboratory, National Institute for the Physics of Matter, Department of Electronic Engineering, University Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Leo
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Colace
authors.forename: Antonio
authors.initials: A
authors.lastname: Amoroso
authors.forename: Andrea
authors.initials: A
authors.lastname: Di Falco
authors.forename: Gaetano
authors.initials: G
authors.lastname: Assanto