Hot carriers photoinduced by fs-laser pulses in photonic nanostructures have been widely investigated. In most of the works a spatially homogeneous excitation pattern is assumed. Here we show how ultrafast hot carrier spatial inhomogeneities at the nanoscale can manifest and even dominate the transient transmission of photonic metasurfaces. An inhomogeneous version of the three-temperature model has been validated on pump-probe spectroscopy measurements in plasmonic metasurfaces. Our results pave the way for the design of novel ultrafast nanophotonic devices.
Ultrafast hot-carrier spatial transients in photonic metasurfaces: experiments, modeling, design
Schirato A.;Crotti G.;Laporta P.;De Angelis C.;Alabastri A.;Cerullo G.;Maiuri M.;Della Valle G.
2023-01-01
Abstract
Hot carriers photoinduced by fs-laser pulses in photonic nanostructures have been widely investigated. In most of the works a spatially homogeneous excitation pattern is assumed. Here we show how ultrafast hot carrier spatial inhomogeneities at the nanoscale can manifest and even dominate the transient transmission of photonic metasurfaces. An inhomogeneous version of the three-temperature model has been validated on pump-probe spectroscopy measurements in plasmonic metasurfaces. Our results pave the way for the design of novel ultrafast nanophotonic devices.File in questo prodotto:
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