title: High second-order nonlinear response of platinum nanoflowers: the role of surface corrugation.
abstract: Platinum nanoflowers (PtNFs) were elaborated using the seed-mediated growth technique applied to monodisperse platinum nanoparticles (∼3.0 nm) synthesized by the chemical reduction method. The X-ray diffraction pattern confirmed the formation of face-centered-cubic platinum nanocrystals. We report the Harmonic Light Scattering (HLS) properties of PtNFs for six different diameters (∼7.0; 8.0; 10.0; 14.0; 20.0 and 31.0 nm). From these HLS data we infer, for the first time, large hyperpolarizability β values of PtNFs. These very high β values of PtNFs are assigned mainly to highly corrugated surfaces for nanoparticles with irregular shapes.
authors.affiliation: Laboratoire de Photonique Quantique et Moléculaire, UMR 8537, Ecole Normale Supérieure de Cachan, CentraleSupélec, CNRS, Université Paris-Saclay, 94235 Cachan, France. ledoux@lpqm.ens-cachan.fr.
authors.forename: Hoang Minh
authors.initials: HM
authors.lastname: Ngo
authors.forename: Ngoc Diep
authors.initials: ND
authors.lastname: Lai
authors.forename: Isabelle
authors.initials: I
authors.lastname: Ledoux-Rak