title: Evanescent-field-induced second harmonic generation by noncentrosymmetric nanoparticles.
abstract: We demonstrate the excitation of second harmonic radiation of noncentrosymmetric nanoparticles dispersed on a planar optical waveguide by the evanescent field of the guided mode. Polarization imaging reveals information on the orientation of the crystal axis of individual nanoparticles. Interference patterns generated from adjacent particles at the second harmonic frequency are--to the authors knowledge--observed for the first time. The actual form of the interference pattern is explained on the basis of a dipole radiation model, taking into account the nanoparticles' orientation, surface effects, and the characteristics of the imaging optics.
authors.affiliation: Laser Laboratorium Göttingen eV, Hans-Adolf Krebsweg 1, 37077 Göttingen, Germany.
authors.forename: Ronja
authors.initials: R
authors.lastname: Bäumner
authors.forename: Luigi
authors.initials: L
authors.lastname: Bonacina
authors.forename: Jörg
authors.initials: J
authors.lastname: Enderlein
authors.forename: Jèrôme
authors.initials: J
authors.lastname: Extermann
authors.forename: Thomas
authors.initials: T
authors.lastname: Fricke-Begemann
authors.forename: Gerd
authors.initials: G
authors.lastname: Marowsky
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Wolf