Ultrafast All-Optical Switching with Magnetic Resonances in Nonlinear Dielectric Nanostructures.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 26393983.
- Also identified by DOI 10.1021/acs.nanolett.5b02989.
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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.
Medical subject headings
- Magnetics
- Nanostructures