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Thermoreflectance of metal transducers for time-domain thermoreflectance
Abstract
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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“For a Ti:sapphire oscillator centered around 800 nm, an Al thin layer with a thickness of ~100 nm is a common choice as the transducer layer due to its strong absorption (the 99% absorption depth is <60 nm) 104 and an exceptionally large thermoreflectance coefficient d R /d T ~ 10 -4 K -1 at the 800-nm wavelength. 98, 105, 106”
From Tutorial: Time-domain thermoreflectance (TDTR) for thermal property characterization of bulk and thin film materials (2018) · cites this paper as [105]
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Metadata
- Authors
- Wang, Y., Park, J. Y., Koh, Y. K., & Cahill, D. G.
- Affiliations
- University of Illinois Urbana-Champaign (US)
- Venue
- Journal of Applied Physics
- Publisher
- AIP Publishing
- Published
- 2010-08-15
- Volume
- 108
- Issue
- 4
- ISSN
- 0021-8979 (ISSN-L)
- 1089-7550
- OpenAlex
- W2094737921
- Cited by
- 112
- References
- 31
- Citations by year
- 2026: 4 · 2025: 12 · 2024: 9 · 2023: 6 · 2022: 9 · 2021: 10 · 2020: 6 · 2019: 7 · 2018: 7 · 2017: 10 · 2016: 8 · 2015: 5 · 2014: 7 · 2013: 6 · 2012: 4
- FWCI
- 6.10
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Applied Physics (publishedVersion)
- Topics
- Physical Sciences › Engineering › Mechanics of Materials › Thermography and Photoacoustic Techniques
- Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Keywords
- thermoreflectance, time-domain thermoreflectance, optical reflectivity, pump-probe spectroscopy, ultrafast laser heating, niobium, rhenium, tantalum, vanadium, aluminum, gold-palladium alloy, optical absorption, surface temperature evolution
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