title: Dipole limit in second-harmonic generation from arrays of gold nanoparticles.
abstract: We present a multipolar tensor analysis of second-harmonic generation from arrays of noncentrosymmetric gold nanoparticles. In contrast to earlier results, where higher multipoles and symmetry-forbidden signals arising from sample defects play a significant role, the present results are completely dominated by symmetry-allowed electric-dipole tensor components. The result arises from significant improvement in sample quality, which suppresses the higher-multipole effects and enhances the overall response by an order of magnitude. The results are a prerequisite for metamaterials with controllable nonlinear properties.
authors.affiliation: Department of Physics, Tampere University of Technology, Tampere, Finland. robert.czaplicki@tut.fi
authors.forename: Robert
authors.initials: R
authors.lastname: Czaplicki
authors.forename: Mariusz
authors.initials: M
authors.lastname: Zdanowicz
authors.forename: Kalle
authors.initials: K
authors.lastname: Koskinen
authors.forename: Janne
authors.initials: J
authors.lastname: Laukkanen
authors.forename: Markku
authors.initials: M
authors.lastname: Kuittinen
authors.forename: Martti
authors.initials: M
authors.lastname: Kauranen
mesh_terms: D003198:Computer Simulation; D006046:Gold / Q000737:chemistry*; D008027:Light; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D012542:Scattering, Radiation
chemical_list: D006046:Gold