Pump-probe spectroscopy study of ultrafast temperature dynamics in nanoporous gold

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2019
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Ortolani, Michele
Mancini, Andrea
Garoli, Denis
de Angelis, Francesco
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Physical Review B. 2019, 99(3), 035435. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.99.035435
Zusammenfassung

We explore the influence of the nanoporous structure on the thermal relaxation of electrons and holes excited by ultrashort laser pulses (∼7fs) in thin gold films. Plasmon decay into hot electron-hole pairs results in the generation of a Fermi-Dirac distribution thermalized at a temperature Te higher than the lattice temperature Tl. The relaxation times of the energy exchange between electrons and lattice, here measured by pump-probe spectroscopy, is slowed down by the nanoporous structure, resulting in much higher peak Te than for bulk gold films. The electron-phonon coupling constant and the Debye temperature are found to scale with the metal filling factor f and a two-temperature model reproduces the data. The results open the way for electron temperature control in metals by engineering of the nanoporous geometry.

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ISO 690ORTOLANI, Michele, Andrea MANCINI, Arne BUDWEG, Denis GAROLI, Daniele BRIDA, Francesco DE ANGELIS, 2019. Pump-probe spectroscopy study of ultrafast temperature dynamics in nanoporous gold. In: Physical Review B. 2019, 99(3), 035435. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.99.035435
BibTex
@article{Ortolani2019-01-24Pumpp-44767,
  year={2019},
  doi={10.1103/PhysRevB.99.035435},
  title={Pump-probe spectroscopy study of ultrafast temperature dynamics in nanoporous gold},
  number={3},
  volume={99},
  issn={2469-9950},
  journal={Physical Review B},
  author={Ortolani, Michele and Mancini, Andrea and Budweg, Arne and Garoli, Denis and Brida, Daniele and de Angelis, Francesco},
  note={Article Number: 035435}
}
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