Tuning the Ultrafast Response of Fano Resonances in Halide Perovskite Nanoparticles
Authors: Franceschini P., Carletti L., Pushkarev AP., Preda F., Perri A., Tognazzi A., Ronchi A., Ferrini G., Pagliara S., Banfi F., Polli D., Cerullo G., De Angelis C., Makarov SV., Giannetti C.
Autors Affiliation: ITMO Univ, St Petersburg 197101, Russia; Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy; NIREOS SRL, I-20158 Milan, Italy;Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy; Consiglio Nazl Ric CNR, Natl Inst Opt INO, I-25123 Brescia, Italy; Univ Cattolica Sacro Cuore, Dept Math & Phys, I-25121 Brescia, Italy; Univ Cattolica Sacro Cuore, ILAMP Interdisciplinary Labs Adv Mat Phys, I-25121 Brescia, Italy: Katholieke Univ Leuven, Dept Phys & Astron, KU Leuven, B-3001 Leuven, Belgium; Univ Claude Bernard Lyon 1, Univ Lyon, CNRS, Inst Lumiere Mat,FemtoNanoOpt Grp, F-69622 Villeurbanne, France; Univ Padua, Dept Informat Engn, I-35131 Padua, Italy
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.
Journal/Review: ACS NANO
Volume: 14 (10) Pages from: 13602 to: 13610