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

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

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ORTOLANI, 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. 99(3), 035435. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.99.035435

@article{Ortolani2019-01-24Pumpp-44767, title={Pump-probe spectroscopy study of ultrafast temperature dynamics in nanoporous gold}, year={2019}, doi={10.1103/PhysRevB.99.035435}, 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} }

2019-01-30T10:46:27Z Ortolani, Michele 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 T<sub>e</sub> higher than the lattice temperature T<sub>l</sub>. 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 T<sub>e</sub> 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. Brida, Daniele de Angelis, Francesco 2019-01-24 Pump-probe spectroscopy study of ultrafast temperature dynamics in nanoporous gold Ortolani, Michele Mancini, Andrea 2019-01-30T10:46:27Z Budweg, Arne de Angelis, Francesco Budweg, Arne Garoli, Denis Brida, Daniele eng Mancini, Andrea Garoli, Denis

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