TY - JOUR
T1 - Thermoreflectance of metal transducers for time-domain thermoreflectance
AU - Wang, Yuxin
AU - Park, Ji Yong
AU - Koh, Yee Kan
AU - Cahill, David G.
N1 - Funding Information:
This work was supported by through the Office of Naval Research MURI Program, Grant No. N00014-07-1-0723 and the Carnegie-DOE Alliance Center. The experiment was carried out in part in the FSMRL Central Facilities, which are partially supported by the U.S. Department of Energy under Grant Nos. DE-FG02-07ER46453 and DE-FG02-07ER46471.
PY - 2010/8/15
Y1 - 2010/8/15
N2 - We report measurements of the temperature dependence of the optical reflectivity, i.e., the thermoreflectance dR/dT, of 18 metallic elements at two laser wavelengths commonly used in ultrafast pump-probe experiments, 1.55 μm and 785 nm. The thermoreflectance is determined using time-domain thermoreflectance combined with measurements of the laser power and spot size and comparisons between the data and quantitative modeling of the temperature evolution at the surface of the sample. At a laser wavelength of 1.55 μm, four elements within this set of samples, Nb, Re, Ta, and V, have dR/dT comparable to or larger than 0.6× 10-4 K -1. At a laser wavelength of 785 nm, the highest thermoreflectance is found in Al and Ta, dR/dT≈2.1× 10-4 K -1 and 2.2× 10-4 K-1, respectively. Alloying Au with 5% Pd increases the optical absorption by a factor of 3 and the thermoreflectance by a factor of 2.
AB - We report measurements of the temperature dependence of the optical reflectivity, i.e., the thermoreflectance dR/dT, of 18 metallic elements at two laser wavelengths commonly used in ultrafast pump-probe experiments, 1.55 μm and 785 nm. The thermoreflectance is determined using time-domain thermoreflectance combined with measurements of the laser power and spot size and comparisons between the data and quantitative modeling of the temperature evolution at the surface of the sample. At a laser wavelength of 1.55 μm, four elements within this set of samples, Nb, Re, Ta, and V, have dR/dT comparable to or larger than 0.6× 10-4 K -1. At a laser wavelength of 785 nm, the highest thermoreflectance is found in Al and Ta, dR/dT≈2.1× 10-4 K -1 and 2.2× 10-4 K-1, respectively. Alloying Au with 5% Pd increases the optical absorption by a factor of 3 and the thermoreflectance by a factor of 2.
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U2 - 10.1063/1.3457151
DO - 10.1063/1.3457151
M3 - Article
AN - SCOPUS:77956310258
SN - 0021-8979
VL - 108
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 4
M1 - 043507
ER -