Cited by 151Thermal properties of materialsThermography and Photoacoustic TechniquesThermoelastic and Magnetoelastic Phenomena

Pump-probe measurements of the thermal conductivity tensor for materials lacking in-plane symmetry

Feser, Joseph P., Liu, Jun, Cahill, David G.·2014·Review of Scientific Instruments

Abstract

We previously demonstrated an extension of time-domain thermoreflectance (TDTR) which utilizes offset pump and probe laser locations to measure in-plane thermal transport properties of multilayers. However, the technique was limited to systems of transversely isotropic materials studied using axisymmetric laser intensities. Here, we extend the mathematics so that data reduction can be performed on non-transversely isotropic systems. An analytic solution of the diffusion equation for an N-layer system is given, where each layer has a homogenous but otherwise arbitrary thermal conductivity tensor and the illuminating spots have arbitrary intensity profiles. As a demonstration, we use both TDTR and time-resolved magneto-optic Kerr effect measurements to obtain thermal conductivity tensor elements of <110> α-SiO2. We show that the out-of-phase beam offset sweep has full-width half-maxima that contains nearly independent sensitivity to the in-plane thermal conductivity corresponding to the scanning direction. Also, we demonstrate a Nb-V alloy as a low thermal conductivity TDTR transducer layer that helps improve the accuracy of in-plane measurements.

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Registry

Crossref · 10.1063/1.4897622

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17 of 17 references verified0 citation errors · 0 not checkable

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  • A thinner transducer with a lower thermal conductivity can minimize lateral heat flow in the transducer layer and thus enhance the measurement sensitivity to the in-plane thermal conductivity.

    “A thinner transducer with a lower thermal conductivity cam minimize lateral heat flow in the transducer layer and thus enhancing the measurement sensitivity to the in-plane thermal conductivity. 34, 87”
  • With a much-reduced thermal conductance of the metal film, the FWHM signal in beam-offset TDTR is more sensitive to the thermal conductivity of the substrate and less sensitive to the properties of the transducer layer, yielding a smaller measurement uncertainty.

    “With a much-reduced thermal conductance of the metal film ( K m h m), the FWHM signal is more sensitive to the thermal conductivity of the substrate and less sensitive to the properties of the transducer layer, thus yielding a smaller measurement uncertainty. 87”

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Authors
Feser, J. P., Liu, J., & Cahill, D. G.
Affiliations
  • University of Delaware (US)
  • University of Illinois 2 Department of Materials Science and Engineering, and Frederick-Seitz Materials Research Laboratory, , Urbana, Illinois 61801, USA
  • University of Illinois Urbana-Champaign (US)
Venue
Review of Scientific Instruments
Published
2014-10-01
Volume
85
Issue
10
Pages
104903-104903
ISSN
  • 0034-6748 (ISSN-L)
  • 1089-7623
OpenAlex
W2079323742
Cited by
151
References
17
Citations by year
2026: 12 · 2025: 22 · 2024: 8 · 2023: 18 · 2022: 17 · 2021: 10 · 2020: 10 · 2019: 17 · 2018: 11 · 2017: 13 · 2016: 8 · 2015: 4 · 2014: 1
FWCI
3.93
Type
journal article
Language
en
Open access
closed
Locations
  • Review of Scientific Instruments (publishedVersion)
  • PubMed (publishedVersion)
Funders
Army Research Office (W911NF-11-10526, W911NF-14-1-0016)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
  • Physical Sciences › Engineering › Mechanics of Materials › Thermography and Photoacoustic Techniques
  • Physical Sciences › Engineering › Mechanics of Materials › Thermoelastic and Magnetoelastic Phenomena
Keywords
thermal conductivity tensor, time-domain thermoreflectance, pump-probe measurement, multilayer systems, diffusion equation, magneto-optical Kerr effect, laser intensity profile

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