Numerical Modeling of Photothermal Experiments on Layered Samples with Mirage-Effect Signal Detection

Modeling of the probe beam deflection caused by temperature gradients for layered sample was realized in COMSOL Multiphysics, which utilizes finite element method to analyze heat transport. The sample consisted of a 100-nm-thick layer on a 500- μ m-thick substrate. It was also assumed that the sampl...

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Bibliographic Details
Published in:International journal of thermophysics 2017-06, Vol.38 (6), p.1-12, Article 93
Main Authors: Bodzenta, Jerzy, Kaźmierczak-Bałata, Anna, Bukowski, Roman, Nowak, Marian, Solecka, Barbara
Format: Article
Language:English
Subjects:
3rd Conference on Photoacoustic and Photothermal Theory and Applications
Classical Mechanics
Condensed Matter Physics
Cppta3
Deflection
Finite element method
Gaussian beams (optics)
Geophysics
Industrial Chemistry/Chemical Engineering
Mathematical analysis
Numerical models
Optical properties
Physical Chemistry
Physics
Physics and Astronomy
Signal detection
Substrates
Temperature effects
Thermodynamics
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Summary:Modeling of the probe beam deflection caused by temperature gradients for layered sample was realized in COMSOL Multiphysics, which utilizes finite element method to analyze heat transport. The sample consisted of a 100-nm-thick layer on a 500- μ m-thick substrate. It was also assumed that the sample was illuminated with either a Gaussian or a flat top beam of harmonically modulated intensity. To obtain the probe beam deflection signal, the normal and tangential components of the temperature gradient in the air above the sample were integrated over the probe beam path. The numerical model of the experiment gave insight into the various parameter dependencies, e.g., the thermal and optical properties of the substrate and the layer, and the geometry of the experiment. These insights are used in the analysis of experimental data and in the planning of future measurements.
ISSN:0195-928X
1572-9567
DOI:10.1007/s10765-017-2219-5