Journal
APPLIED PHYSICS LETTERS
Volume 78, Issue 9, Pages 1240-1242Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1351523
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Ultrashort pulsed lasers have repeatedly been demonstrated as effective tools for the observation of transport properties on atomistic time and length scales. Transient thermoreflectance scans of a Au thin film taken using a 200 fs pulsed laser are compared to the parabolic two step model using both the assumption of a linear relationship between reflectance and temperature and using an intraband reflectance model. In this study, the incident photon energy was less than the interband transition energy, therefore the thermoreflectance response is primarily due to intraband transitions. The intraband transitions are influenced by the electron and lattice temperatures through the electron collisional frequency. (C) 2001 American Institute of Physics.
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