Shcherbakov, Maxim R.Vabishchevich, Polina P.Shorokhov, Alexander S.Chong, KatieStaude, IsabelleNeshev, DragomirFedyanin, AndreyMiroshnichenko, AndreyKivshar, YuriChoi, Duk-Yong2016-02-241530-6984http://hdl.handle.net/1885/98622We 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.201510.1021/acs.nanolett.5b029892024-03-03