An. Smith et Pm. Norris, Influence of intraband transitions on the electron thermoreflectance response of metals, APPL PHYS L, 78(9), 2001, pp. 1240-1242
Ultrashort pulsed lasers have repeatedly been demonstrated as effective too
ls 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 temperatur
e and using an intraband reflectance model. In this study, the incident pho
ton energy was less than the interband transition energy, therefore the the
rmoreflectance response is primarily due to intraband transitions. The intr
aband transitions are influenced by the electron and lattice temperatures t
hrough the electron collisional frequency. (C) 2001 American Institute of P
hysics.