Thermoreflectance of metal transducers for optical pump-probe studies of thermal properties

We report measurements of the temperature dependence of the optical reflectivity, dR/dT of fifteen metallic elements at a wavelength of λ = 1.03 μm by time-domain thermoreflectance (TDTR); and the thermoreflectance of thin-films of Pt, Ta, Al, Au, SrRuO(3), and LaNiO(3) over the wavelength range 0.4...

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Bibliographic Details
Published in:Optics express 2012-12, Vol.20 (27), p.28829-28838
Main Authors: Wilson, R B, Apgar, Brent A, Martin, Lane W, Cahill, David G
Format: Article
Language:English
Subjects:
Equipment Design
Equipment Failure Analysis
Lasers
Lenses
Light
Metals - chemistry
Scattering, Radiation
Temperature
Thermal Conductivity
Transducers
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Summary:We report measurements of the temperature dependence of the optical reflectivity, dR/dT of fifteen metallic elements at a wavelength of λ = 1.03 μm by time-domain thermoreflectance (TDTR); and the thermoreflectance of thin-films of Pt, Ta, Al, Au, SrRuO(3), and LaNiO(3) over the wavelength range 0.4 < λ < 1.6 μm using variable angle spectroscopic ellipsometry. At λ = 1.03 μm, Al, Ta, Re, Ru, have high values of thermoreflectance, dR/dT > 6∙10(-5) K(-1), and are good choices as optical transducers for TDTR experiments using a Yb:fiber laser oscillator. If low optical reflectivity and the associated high degree of steady-state heating are not a concern, LaNiO(3) provides an exceptionally sensitive thermometer in the infrared; (1/R)(dR/dT) > 2.5∙10(-4) K(-1) in the wavelength range 0.85 < λ < 1.3 μm. This compilation of data will assist in the design and interpretation of optical pump-probe studies of thermal properties.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.20.028829