6533b82cfe1ef96bd1290168
RESEARCH PRODUCT
Tuning the Ultrafast Response of Fano Resonances in Halide Perovskite Nanoparticles
Luca CarlettiLuca CarlettiDario PolliGabriele FerriniAnatoly P. PushkarevAndrea RonchiAndrea RonchiFabrizio PredaGiulio CerulloAndrea TognazziClaudio GiannettiFrancesco BanfiPaolo FranceschiniPaolo FranceschiniCostantino De AngelisSergey V. MakarovAntonio PerriStefania Pagliarasubject
Materials scienceTerahertz radiationNanophotonicsFOS: Physical sciencesGeneral Physics and AstronomyPhysics::Optics02 engineering and technology010402 general chemistrySettore FIS/03 - FISICA DELLA MATERIA01 natural sciencesOptical switchhalide perovskites nanoparticles[SPI]Engineering Sciences [physics]Fano resonance; halide perovskites nanoparticles; ultrafast photophysics; nanophotonics; Mie resonancesPhysics::Atomic and Molecular Clusters[CHIM]Chemical SciencesGeneral Materials ScienceThin filmPhysics::Chemical PhysicsPerovskite (structure)[PHYS]Physics [physics]Condensed Matter - Materials Sciencebusiness.industryMie resonancesGeneral EngineeringMaterials Science (cond-mat.mtrl-sci)Fano resonanceMetamaterialSettore ING-INF/02 - Campi Elettromagnetici021001 nanoscience & nanotechnology0104 chemical sciencesOptoelectronicsFano resonancenanophotonics0210 nano-technologybusinessultrafast photophysicsUltrashort pulseOptics (physics.optics)Physics - Opticsdescription
International audience; 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-10-27 |