This paper describes the instrumentation for broadband frequency domain thermoreflectance (BB-FDTR), a novel, continuous wave laser technique for measuring the thermal conductivity accumulation function. The thermal conductivity accumulation function describes cumulative contributions to the bulk thermal conductivity of a material from energy carriers with different mean free paths. It can be used to map reductions in thermal conductivity in nano-devices, which arise when the dimensions of the device are commensurate to the mean free path of energy carriers. BB-FDTR uses high frequency surface temperature modulation to generate non-diffusive phonon transport realized through a reduction in the perceived thermal conductivity. By controlling the modulation frequency it is possible to reconstruct the thermal conductivity accumulation function. A unique heterodyning technique is used to down-convert the signal, therein improving our signal to noise ratio and enabling results over a broader range of modulation frequencies (200 kHz–200 MHz) and hence mean free paths.
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June 2013
Research Article|
June 06 2013
Instrumentation of broadband frequency domain thermoreflectance for measuring thermal conductivity accumulation functions
K. T. Regner;
K. T. Regner
1Department of Mechanical Engineering,
Carnegie Mellon University
, Pittsburgh, Pennsylvania 15213, USA
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S. Majumdar;
S. Majumdar
1Department of Mechanical Engineering,
Carnegie Mellon University
, Pittsburgh, Pennsylvania 15213, USA
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J. A. Malen
J. A. Malen
a)
1Department of Mechanical Engineering,
Carnegie Mellon University
, Pittsburgh, Pennsylvania 15213, USA
2Department of Materials Science and Engineering,
Carnegie Mellon University
, Pittsburgh, Pennsylvania 15213, USA
Search for other works by this author on:
K. T. Regner
1
S. Majumdar
1
J. A. Malen
1,2,a)
1Department of Mechanical Engineering,
Carnegie Mellon University
, Pittsburgh, Pennsylvania 15213, USA
2Department of Materials Science and Engineering,
Carnegie Mellon University
, Pittsburgh, Pennsylvania 15213, USA
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
Rev. Sci. Instrum. 84, 064901 (2013)
Article history
Received:
March 29 2013
Accepted:
May 15 2013
Citation
K. T. Regner, S. Majumdar, J. A. Malen; Instrumentation of broadband frequency domain thermoreflectance for measuring thermal conductivity accumulation functions. Rev. Sci. Instrum. 1 June 2013; 84 (6): 064901. https://doi.org/10.1063/1.4808055
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