Article (Scientific journals)
Pump-probe spectroscopy study of ultrafast temperature dynamics in nanoporous gold
Ortolani, Michele; Mancini, Andrea; Budweg, Arne et al.
2019In Physical Review. B, 99 (3)
Peer reviewed
 

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Abstract :
[en] We explore the influence of the nanoporous structure on the thermal relaxation of electrons and holes excited by ultrashort laser pulses (similar to 7 fs) 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-e higher than the lattice temperature T-1. 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-e 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.
Disciplines :
Physics
Author, co-author :
Ortolani, Michele
Mancini, Andrea
Budweg, Arne
Garoli, Denis
Brida, Daniele ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
de Angelis, Francesco
External co-authors :
yes
Title :
Pump-probe spectroscopy study of ultrafast temperature dynamics in nanoporous gold
Publication date :
2019
Journal title :
Physical Review. B
ISSN :
2469-9950
Publisher :
AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, Unknown/unspecified
Volume :
99
Issue :
3
Peer reviewed :
Peer reviewed
Commentary :
Article
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since 22 January 2020

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