Article Dans Une Revue Light: Science and Applications Année : 2024

Giant ultrafast dichroism and birefringence with active nonlocal metasurfaces

Résumé

Switching of light polarization on the sub-picosecond timescale is a crucial functionality for applications in a variety of contexts, including telecommunications, biology and chemistry. The ability to control polarization at ultrafast speed would pave the way for the development of unprecedented free-space optical links and of novel techniques for probing dynamical processes in complex systems, as chiral molecules. Such high switching speeds can only be reached with an all-optical paradigm, i.e., engineering active platforms capable of controlling light polarization via ultrashort laser pulses. Here we demonstrate giant modulation of dichroism and birefringence in an all-dielectric metasurface, achieved at low fluences of the optical control beam. This performance, which leverages the many degrees of freedom offered by all-dielectric active metasurfaces, is obtained by combining a high-quality factor nonlocal resonance with the giant third-order optical nonlinearity dictated by photogenerated hot carriers at the semiconductor band edge.

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hal-04937326 , version 1 (10-02-2025)

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Giulia Crotti, Mert Akturk, Andrea Schirato, Vincent Vinel, Anton A Trifonov, et al.. Giant ultrafast dichroism and birefringence with active nonlocal metasurfaces. Light: Science and Applications, 2024, 13 (204), ⟨10.1038/s41377-024-01545-8⟩. ⟨hal-04937326⟩
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