Crotti, GiuliaAkturk, MertSchirato, AndreaVinel, VincentZaccaria, Remo ProiettiMaiuri, MargheritaTrifonov, AntonBuchvarov, IvanNeshev, DragomirLeo, GiuseppeCerullo, GiulioDella Valle, Giuseppede Ceglia, DomenicoRaposo, MariaRibeiro, PauloAlbella, Pablo2024-07-172024-07-1716 - 18 Fe978-989-758-632-3https://hdl.handle.net/1885/733713977The ability to manipulate light polarization at an ultrafast speed is a challenging goal in the field of Photonics: sub-picosecond control of polarization is a fundamental functionality for a variety of applications, including the developement of free-space optical links for robust information encoding. To this aim, an important paradigm consists in employing metasurfaces as platforms which can be reconfigurable by all-optical means, i.e. upon illumination by an energetic femtosecond laser pulse. Here, we present giant all-optical modulations of dichroism in an anisotropic AlGaAs metasurface. An optimized design allows to exploit a sharp extended resonance of the nanostructure in the desired spectral range, where the pump-induced band-filling effect is the dominant process presiding over the ultrafast change of permittivity.application/pdfen-AUCopyright © 2023 by SCITEPRESShttp://creativecommons.org/licenses/by-nc-nd/4.0/Ultrafast PhotonicsAll-Optical Polarization ControlReconfigurable Metasurfaces202310.5220/00119266000034082023-12-24CC BY-NC-ND 4.0