The femtosecond evolution of the electronic temperature of laser-excited gold nanoparticles is measured, by means of ultrafast time-resolved photoemission spectroscopy induced by extreme-ultraviolet radiation pulses. The temperature of the electron gas is deduced by recording and fitting high-resolution photo emission spectra around the Fermi edge of gold nanoparticles providing a direct, unambiguous picture of the ultrafast electron-gas dynamics. These results will be instrumental to the refinement of existing models of femtosecond processes in laterally-confined and bulk condensed-matter systems, and for understanding more deeply the role of hot electrons in technological applications.
Quantitative Ultrafast Electron-Temperature Dynamics in Photo-Excited Au Nanoparticles / Sygletou, M., Benedetti, S., Ferrera, M., Marco Pierantozzi, G., Cucini, R., Della Valle, G., Carrara, P., De Vita, A., Di Bona, A., Torelli, P., Catone, D., Panaccione, G., Canepa, M., Bisio, F.. - In: SMALL. - ISSN 1613-6829. - 17:26(2021), pp. e2100050-e2100050. [10.1002/smll.202100050]
Quantitative Ultrafast Electron-Temperature Dynamics in Photo-Excited Au Nanoparticles
Stefania Benedetti;Alessandro di Bona;Maurizio Canepa;
2021
Abstract
The femtosecond evolution of the electronic temperature of laser-excited gold nanoparticles is measured, by means of ultrafast time-resolved photoemission spectroscopy induced by extreme-ultraviolet radiation pulses. The temperature of the electron gas is deduced by recording and fitting high-resolution photo emission spectra around the Fermi edge of gold nanoparticles providing a direct, unambiguous picture of the ultrafast electron-gas dynamics. These results will be instrumental to the refinement of existing models of femtosecond processes in laterally-confined and bulk condensed-matter systems, and for understanding more deeply the role of hot electrons in technological applications.
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