Reference : Pump-probe spectroscopy study of ultrafast temperature dynamics in nanoporous gold
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/41879
Pump-probe spectroscopy study of ultrafast temperature dynamics in nanoporous gold
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Ortolani, Michele []
Mancini, Andrea []
Budweg, Arne []
Garoli, Denis []
Brida, Daniele mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
de Angelis, Francesco []
2019
PHYSICAL REVIEW B
AMER PHYSICAL SOC
99
3
Yes (verified by ORBilu)
2469-9950
ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
[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.
http://hdl.handle.net/10993/41879
10.1103/PhysRevB.99.035435
Article

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