Thermal considerations affect the performance of most microsystems. Although surface techniques can give information on the thermal properties within the material or about buried heat sources and defects, mapping temperature and thermal properties in three dimension (3D) is critical and has not been addressed yet. Infrared thermography, commonly used for opaque materials, is not adapted to semi-transparent samples such as microfluidic chips or semiconductor materials in the infrared range. This work aims at answering these needs by using the variations of transmittance with temperature to obtain information on the temperature within the thickness of the sample. We use a tunable mid-infrared light source combined with an infrared camera to measure these variations of transmittance in a glass wafer. We couple this technique with a thermal model to extract the thermotransmittance coefficient—the coefficient of temperature variation of the transmittance. We then introduce a semiempirical model based on Lorentz oscillators to estimate the temperature-dependent optical properties of our sample in the mid-IR spectral range. Combined with the measurement, this paper reports the spectroscopic behavior of the thermotransmittance coefficient in the mid-IR range and a way to predict it.
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1 January 2024
Research Article|
January 05 2024
Mid-infrared spectroscopic thermotransmittance measurements in dielectric materials for thermal imaging Available to Purchase
C. Bourges
;
C. Bourges
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
University Bordeaux, CNRS, Bordeaux INP, I2M, UMR 5295
, F-33400 Talence, France
2
ENSAM, CNRS, Bordeaux INP, I2M, UMR 5295
, F-33400 Talence, France
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S. Chevalier
;
S. Chevalier
a)
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
University Bordeaux, CNRS, Bordeaux INP, I2M, UMR 5295
, F-33400 Talence, France
2
ENSAM, CNRS, Bordeaux INP, I2M, UMR 5295
, F-33400 Talence, France
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J. Maire
;
J. Maire
a)
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
University Bordeaux, CNRS, Bordeaux INP, I2M, UMR 5295
, F-33400 Talence, France
2
ENSAM, CNRS, Bordeaux INP, I2M, UMR 5295
, F-33400 Talence, France
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A. Sommier
;
A. Sommier
(Conceptualization, Data curation, Methodology, Validation, Writing – original draft, Writing – review & editing)
1
University Bordeaux, CNRS, Bordeaux INP, I2M, UMR 5295
, F-33400 Talence, France
2
ENSAM, CNRS, Bordeaux INP, I2M, UMR 5295
, F-33400 Talence, France
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C. Pradere
;
C. Pradere
(Conceptualization, Project administration, Supervision, Validation, Writing – original draft, Writing – review & editing)
3
EPSYL-ALCEN
, F-33400 Talence, France
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S. Dilhaire
S. Dilhaire
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing)
4
Université de Bordeaux, LOMA, CNRS UMR 5798
, F-33400 Talence, France
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C. Bourges
1,2
S. Chevalier
1,2,a)
J. Maire
1,2,a)
A. Sommier
1,2
C. Pradere
3
S. Dilhaire
4
1
University Bordeaux, CNRS, Bordeaux INP, I2M, UMR 5295
, F-33400 Talence, France
2
ENSAM, CNRS, Bordeaux INP, I2M, UMR 5295
, F-33400 Talence, France
3
EPSYL-ALCEN
, F-33400 Talence, France
4
Université de Bordeaux, LOMA, CNRS UMR 5798
, F-33400 Talence, France
Appl. Phys. Lett. 124, 012202 (2024)
Article history
Received:
September 15 2023
Accepted:
December 16 2023
Citation
C. Bourges, S. Chevalier, J. Maire, A. Sommier, C. Pradere, S. Dilhaire; Mid-infrared spectroscopic thermotransmittance measurements in dielectric materials for thermal imaging. Appl. Phys. Lett. 1 January 2024; 124 (1): 012202. https://doi.org/10.1063/5.0176689
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