Tuning the Ultrafast Response of Fano Resonances in Halide Perovskite Nanoparticles

Gabriele Ferrini, Stefania Pagliara, Francesco Banfi, Claudio Giannetti, Paolo Franceschini, Alessandro Perri, Andrea Tognazzi, Andrea Ronchi, Claudio De Angelis, Luca Carletti, Anatoly P. Pushkarev, Fabrizio Preda, Antonio Perri, Dario Polli, Giulio Cerullo, Costantino De Angelis

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

Abstract

The full control of the fundamental photophysics of nanosystems at frequencies as high as few THz is key for tunable and ultrafast nanophotonic devices and metamaterials. Here we combine geometrical and ultrafast control of the optical properties of halide perovskite nanoparticles, which constitute a prominent platform for nanophotonics. The pulsed photoinjection of free carriers across the semiconducting gap leads to a subpicosecond modification of the far-field electromagnetic properties that is fully controlled by the geometry of the system. When the nanoparticle size is tuned so as to achieve the overlap between the narrowband excitons and the geometry-controlled Mie resonances, the ultrafast modulation of the transmittivity is completely reversed with respect to what is usually observed in nanoparticles with different sizes, in bulk systems, and in thin films. The interplay between chemical, geometrical, and ultrafast tuning offers an additional control parameter with impact on nanoantennas and ultrafast optical switches.
Lingua originaleEnglish
pagine (da-a)13602-13610
Numero di pagine9
RivistaACS Nano
Volume14
DOI
Stato di pubblicazionePubblicato - 2020

Keywords

  • Fano resonance
  • Mie resonances
  • halide perovskites nanoparticles
  • nanophotonics
  • ultrafast photophysics

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