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Capturing the Cumulative Effect in the Pump Probe Transient Thermoreflectance Technique using Network Identification by Deconvolution Method

Published online by Cambridge University Press:  17 October 2011

Y. Ezzahri ,
G. Pernot ,
K. Joulain  and
A. Shakouri
Y. Ezzahri*
Affiliation:
Institut Pprime, CNRS-Université de Poitiers-ENSMA, Département Fluides, Thermique, Combustion, ENSIP-Bâtiment de mécanique, 2 rue Pierre Brousse, F 86022 Poitiers, Cedex, France.
G. Pernot
Affiliation:
Department of Electrical Engineering, University of California at Santa Cruz, 1156 High street, Santa Cruz, California, 95064, USA.
K. Joulain
Affiliation:
Institut Pprime, CNRS-Université de Poitiers-ENSMA, Département Fluides, Thermique, Combustion, ENSIP-Bâtiment de mécanique, 2 rue Pierre Brousse, F 86022 Poitiers, Cedex, France.
A. Shakouri
Affiliation:
Department of Electrical Engineering, University of California at Santa Cruz, 1156 High street, Santa Cruz, California, 95064, USA.
*
*Email: [email protected]
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Abstract

Network Identification by Deconvolution (NID) method is used to capture the heat cumulative effect in the homodyne configuration of the Pump-Probe Transient Thermoreflectance (PPTTR) experiment. This cumulative effect is very important in the interpretation of the PPTTR which is becoming widely used for the extraction of thin film thermal conductivity. We show that this intrinsic behavior can be introduced as a cumulative effect weight function in the time constant spectrum of the structure under study. We show how the main features of this weight function change when we change the laser repetition rate and/or the laser pump beam modulation frequency, and how these changes may affect the extraction of the thermal properties of the sample under study, particularly the thermal conductivity and the interface thermal resistance. Numerical simulations of the PPTTR experiment are used to validate the application of NID method. Limitations of the method will also be discussed.

Keywords

nanoscalethermal conductivitythin film
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1347: Symposium BB – Nanoscale Heat Transport—From Fundamentals to Devices , 2011 , mrss11-1347-bb07-05
Copyright
Copyright © Materials Research Society 2011

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References

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