title: Giant enhancement of second-harmonic generation in multiple diffraction orders from sub-wavelength resonant waveguide grating.
abstract: We demonstrate a purely dielectric resonant waveguide structure that enhances the efficiency of second-harmonic generation by a factor of at least 5500 compared to a flat reference surface in the same geometry. We also show that the structure emits second-harmonic radiation in four different directions when the sample is illuminated with fundamental radiation incident at the resonant angle of the sample.
authors.affiliation: Optics Laboratory, Department of Physics, Tampere University of Technology, FIN-33101 Tampere, Finland.
authors.forename: A
authors.initials: A
authors.lastname: Saari
authors.forename: G
authors.initials: G
authors.lastname: Genty
authors.forename: M
authors.initials: M
authors.lastname: Siltanen
authors.forename: P
authors.initials: P
authors.lastname: Karvinen
authors.forename: P
authors.initials: P
authors.lastname: Vahimaa
authors.forename: M
authors.initials: M
authors.lastname: Kuittinen
authors.forename: M
authors.initials: M
authors.lastname: Kauranen