Ultrafast All-Optical Switching with Magnetic Resonances in Nonlinear Dielectric Nanostructures
Maxim R. ShcherbakovFaculty of Physics, Lomonosov Moscow State University, Moscow 119991, RussiaPolina P. VabishchevichFaculty of Physics, Lomonosov Moscow State University, Moscow 119991, RussiaAlexander S. ShorokhovFaculty of Physics, Lomonosov Moscow State University, Moscow 119991, RussiaKatie E. ChongDuk‐Yong ChoiIsabelle StaudeAndrey E. MiroshnichenkoDragomir N. NeshevAndrey A. FedyaninFaculty of Physics, Lomonosov Moscow State University, Moscow 119991, RussiaYuri S. Kivshar
2015en
ABI
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.
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Cited by 30 references