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Title: Parametric Study of the Frequency-Domain Thermoreflectance Technique

Abstract

Without requiring regression for parameter determination, one-dimensional (1D) analytical models are used by many research groups to extract the thermal properties in frequency-domain thermoreflectance measurements. Experimentally, this approach involves heating the sample with a pump laser and probing the temperature response with spatially coincident probe laser. Micron order lateral resolution can be obtained by tightly focusing the pump and probe lasers. However, small laser beam spot sizes necessarily bring into question the assumptions associated with 1D analytical models. In this study, we analyzed the applicability of 1D analytical models by comparing to 2D analytical and fully numerical models. Specifically, we considered a generic nlayer two-dimensional (2D), axisymmetric analytical model including effects of volumetric heat absorption, contact resistance, and anisotropic properties. In addition, a finite element numerical model was employed to consider nonlinear effects caused by temperature dependent thermal conductivity. Nonlinearity is of germane importance to frequency domain approaches because the experimental geometry is such that the probe is always sensing the maximum temperature fluctuation. To quantify the applicability of the 1D model, parametric studies were performed considering the effects of: film thickness, heating laser size, probe laser size, substrate-to-film effusivity ratio, interfacial thermal resistance between layers, volumetric heating, substrate thermalmore » conductivity, nonlinear boundary conditions, and anisotropic and temperature dependent thermal conductivity.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1062186
Report Number(s):
INL/JOU-13-28286
Journal ID: ISSN 0021-8979
DOE Contract Number:  
DE-AC07-05ID14517
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 112; Journal Issue: 10; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS; thermoreflectance technique

Citation Formats

C. Xing, C. Jensen, Z. Hua, H. Ban, D. H. Hurley, M. Khafizov, and J. Rory Kennedy. Parametric Study of the Frequency-Domain Thermoreflectance Technique. United States: N. p., 2012. Web. doi:10.1063/1.4761977.
C. Xing, C. Jensen, Z. Hua, H. Ban, D. H. Hurley, M. Khafizov, & J. Rory Kennedy. Parametric Study of the Frequency-Domain Thermoreflectance Technique. United States. doi:10.1063/1.4761977.
C. Xing, C. Jensen, Z. Hua, H. Ban, D. H. Hurley, M. Khafizov, and J. Rory Kennedy. Thu . "Parametric Study of the Frequency-Domain Thermoreflectance Technique". United States. doi:10.1063/1.4761977.
@article{osti_1062186,
title = {Parametric Study of the Frequency-Domain Thermoreflectance Technique},
author = {C. Xing and C. Jensen and Z. Hua and H. Ban and D. H. Hurley and M. Khafizov and J. Rory Kennedy},
abstractNote = {Without requiring regression for parameter determination, one-dimensional (1D) analytical models are used by many research groups to extract the thermal properties in frequency-domain thermoreflectance measurements. Experimentally, this approach involves heating the sample with a pump laser and probing the temperature response with spatially coincident probe laser. Micron order lateral resolution can be obtained by tightly focusing the pump and probe lasers. However, small laser beam spot sizes necessarily bring into question the assumptions associated with 1D analytical models. In this study, we analyzed the applicability of 1D analytical models by comparing to 2D analytical and fully numerical models. Specifically, we considered a generic nlayer two-dimensional (2D), axisymmetric analytical model including effects of volumetric heat absorption, contact resistance, and anisotropic properties. In addition, a finite element numerical model was employed to consider nonlinear effects caused by temperature dependent thermal conductivity. Nonlinearity is of germane importance to frequency domain approaches because the experimental geometry is such that the probe is always sensing the maximum temperature fluctuation. To quantify the applicability of the 1D model, parametric studies were performed considering the effects of: film thickness, heating laser size, probe laser size, substrate-to-film effusivity ratio, interfacial thermal resistance between layers, volumetric heating, substrate thermal conductivity, nonlinear boundary conditions, and anisotropic and temperature dependent thermal conductivity.},
doi = {10.1063/1.4761977},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 10,
volume = 112,
place = {United States},
year = {2012},
month = {11}
}