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, Maria; Benedetti, Stefania; Ferrera, Marzia; Marco Pierantozzi, Gian; Cucini, Riccardo; Della Valle, Giuseppe; Carrara, Pietro; De Vita, Alessandro; DI BONA, Alessandro; Torelli, Piero; Catone, Daniele; Panaccione, Giancarlo; Canepa, Maurizio; Bisio, Francesco. - 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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