title: Ultrafast All-Optical Switching with Magnetic Resonances in Nonlinear Dielectric Nanostructures.
abstract: We demonstrate experimentally ultrafast all-optical switching in subwavelength nonlinear dielectric nanostructures exhibiting localized magnetic Mie resonances. We employ amorphous silicon nanodisks to achieve strong self-modulation of femtosecond pulses with a depth of 60% at picojoule-per-disk pump energies. In the pump-probe measurements, we reveal that switching in the nanodisks can be governed by pulse-limited 65 fs-long two-photon absorption being enhanced by a factor of 80 with respect to the unstructured silicon film. We also show that undesirable free-carrier effects can be suppressed by a proper spectral positioning of the magnetic resonance, making such a structure the fastest all-optical switch operating at the nanoscale.
authors.affiliation: Faculty of Physics, Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Maxim R
authors.initials: MR
authors.lastname: Shcherbakov
authors.affiliation: Faculty of Physics, Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Polina P
authors.initials: PP
authors.lastname: Vabishchevich
authors.affiliation: Faculty of Physics, Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Shorokhov
authors.forename: Katie E
authors.initials: KE
authors.lastname: Chong
authors.forename: Duk-Yong
authors.initials: DY
authors.lastname: Choi
authors.forename: Isabelle
authors.initials: I
authors.lastname: Staude
authors.forename: Andrey E
authors.initials: AE
authors.lastname: Miroshnichenko
authors.forename: Dragomir N
authors.initials: DN
authors.lastname: Neshev
authors.affiliation: Faculty of Physics, Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Fedyanin
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar
mesh_terms: D008280:Magnetics; D049329:Nanostructures; D017785:Photons
keywords: Nonlinear optics; all-optical switching; femtosecond optics; metasurfaces; optical magnetism; silicon photonics