Ultrafast All-Optical Switching with Magnetic Resonances in Nonlinear Dielectric Nanostructures

  • Shcherbakov M
  • Vabishchevich P
  • Shorokhov A
 et al. 
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© 2015 American Chemical Society. 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.

Author-supplied keywords

  • Nonlinear optics
  • all-optical switching
  • femtosecond optics
  • metasurfaces
  • optical magnetism
  • silicon photonics

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  • M.R. Shcherbakov

  • P.P. Vabishchevich

  • A.S. Shorokhov

  • K.E. Chong

  • D.-Y. Choi

  • I. Staude

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