title: Enhanced third-harmonic generation in silicon nanoparticles driven by magnetic response.
abstract: We observe enhanced third-harmonic generation from silicon nanodisks exhibiting both electric and magnetic dipolar resonances. Experimental characterization of the nonlinear optical response through third-harmonic microscopy and spectroscopy reveals that the third-harmonic generation is significantly enhanced in the vicinity of the magnetic dipole resonances. The field localization at the magnetic resonance results in two orders of magnitude enhancement of the harmonic intensity with respect to unstructured bulk silicon with the conversion efficiency limited only by the two-photon absorption in the substrate.
authors.affiliation: Faculty of Physics, Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Maxim R
authors.initials: MR
authors.lastname: Shcherbakov
authors.forename: Dragomir N
authors.initials: DN
authors.lastname: Neshev
authors.forename: Ben
authors.initials: B
authors.lastname: Hopkins
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Shorokhov
authors.forename: Isabelle
authors.initials: I
authors.lastname: Staude
authors.forename: Elizaveta V
authors.initials: EV
authors.lastname: Melik-Gaykazyan
authors.forename: Manuel
authors.initials: M
authors.lastname: Decker
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Ezhov
authors.forename: Andrey E
authors.initials: AE
authors.lastname: Miroshnichenko
authors.forename: Igal
authors.initials: I
authors.lastname: Brener
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Fedyanin
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar
keywords: multipole decomposition; nonlinear optics; optical magnetism; silicon nanoparticles; third-harmonic generation