Ultrafast All-Optical Switching with Magnetic Resonances in Nonlinear Dielectric Nanostructures.
Nano Lett
; 15(10): 6985-90, 2015 Oct 14.
Article
em En
| MEDLINE
| ID: mdl-26393983
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.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Nanoestruturas
/
Magnetismo
Idioma:
En
Revista:
Nano Lett
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Federação Russa