title: Spatial nonreciprocity in waveguide second-order processes.
abstract: We show numerically and experimentally that second-harmonic generation in spatially nonsymmetrical structures can show a direction-dependent or nonreciprocal behavior under a variety of conditions.
authors.forename: C G
authors.initials: CG
authors.lastname: Treviño-Palacios
authors.forename: G I
authors.initials: GI
authors.lastname: Stegeman
authors.forename: P
authors.initials: P
authors.lastname: Baldi