Limits to Fourier theory in high thermal conductivity single crystals

R. B. Wilson, David G. Cahill

Research output: Contribution to journalArticle

Abstract

We report the results of time-domain thermoreflectance (TDTR) experiments that examine the ability of Fourier theory to predict the thermal response in single crystals when heater dimensions are small. We performed TDTR measurements on Al-coated diamond, 6H-SiC, GaP, Ge, MgO, GaAs, and GaSb single crystals with a wide range of laser spot size radii, 0.7 μm < w 0 < 12 μm. When the laser spot-size is large, w 0 ≈ 12 μm, TDTR data for all crystals are in agreement with predictions of Fourier theory with bulk thermal conductivity values. When the laser spot-size is small, w 0 < 2 μm, there are significant differences between the predictions of Fourier theory and TDTR data for all crystals except MgO.

Original languageEnglish (US)
Article number203112
JournalApplied Physics Letters
Volume107
Issue number20
DOIs
StatePublished - Nov 16 2015

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thermal conductivity
single crystals
lasers
predictions
heaters
crystals
diamonds
radii

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Limits to Fourier theory in high thermal conductivity single crystals. / Wilson, R. B.; Cahill, David G.

In: Applied Physics Letters, Vol. 107, No. 20, 203112, 16.11.2015.

Research output: Contribution to journalArticle

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