All‐Optical Modulation with Dielectric Nanoantennas: Multiresonant Control and Ultrafast Spatial Inhomogeneities

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Abstract
We study the transient optical response of multi‐resonant all‐dielectric nanoantennas via a combination of broadband ultrafast reflectivity experiments and nonlinear optics nanoscale modeling. Ultrafast all‐optical control of the reflectivity is demonstrated in variably sized Al.18Ga.82As nanoantennas over four distinct Mie resonances (including Fano‐like resonances), spanning a broad spectral range, from the red to the near infrared. A spatially inhomogeneous dynamical model, that accounts for diffusion of the photogenerated carriers inside the semiconductor, is introduced and exploited to isolate the physical phenomena leading to the overall transient response, namely, Drude plasma formation, Pauli blocking following band filling and thermo‐optical effect. Our results pave the way to the development of multi‐wavelength all‐optically reconfigurable filters for next‐generation ultrafast add/drop multiplexing.
Funding Information
  • H2020 Future and Emerging Technologies (899673)
  • Ministero dell’Istruzione, dell’Università e della Ricerca (2017MP7F8F)
  • Agence Nationale de la Recherche (ANR-18-CE92-0043)

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