DocumentCode :
1924936
Title :
Nonequilibrium electron interactions in metal films
Author :
Del Fatti, F. ; Flytzanis, Christos
Author_Institution :
Lab. d´Opt. Quantique, Ecole Polytech., Palaiseau, France
fYear :
1998
fDate :
8-8 May 1998
Firstpage :
64
Lastpage :
65
Abstract :
Summary form only given.Femtosecond spectroscopy has been largely exploited in metal films to investigate electron interaction processes, with a special emphasis on the internal and/or external electron gas thermalization due to electron-electron and electron-phonon scattering. The interplay between these processes for strongly nonequilibrium distributions has been evoked but not directly demonstrated. We have investigated this effect using a femtosecond pump-probe technique with 20-fs pulses. Measurements were performed by probing the changes of the optical properties of a metal film far from the interband transitions. This permits investigation of the average electron properties and of their dependence on the electron distribution. The results clearly demonstrate acceleration of both the energy losses of the electron gas to the lattice and of the average electron-electron scattering, during the early stages of the nonequilibrium electron relaxation. Similar results were also obtained in metal nanoparticles systems.
Keywords :
dielectric function; electron gas; electron-phonon interactions; metal theory; metallic thin films; time resolved spectra; umklapp process; 20 fs; average electron properties; average electron-electron scattering; dielectric function; electron distribution; electron gas; electron-phonon scattering; energy losses; femtosecond pump-probe technique; femtosecond spectroscopy; interband transitions; metal films; metal nanoparticles; nonequilibrium electron interactions; nonequilibrium electron relaxation; optical property changes; thermalization; umklapp collision; Acceleration; Charge carrier processes; Electron optics; Optical films; Optical pulses; Optical pumping; Optical scattering; Performance evaluation; Spectroscopy; Ultrafast optics;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Quantum Electronics Conference, 1998. IQEC 98. Technical Digest. Summaries of papers presented at the International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-541-2
Type :
conf
DOI :
10.1109/IQEC.1998.680131
Filename :
680131
Link To Document :
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