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Journal of Applied Physics

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AIP Publishing LLC





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We demonstrate the influence of edge effects on the photothermal-induced phase shift measured by a homodyne quadrature laser interferometer and compare the experiments with rigorous theoretical descriptions of thermoelastic surface displacement of metals. The finite geometry of the samples is crucial in determining how the temperature is distributed across the material and how this affects the interferometer phase shift measurements. The optical path change due to the surface thermoelastic deformation and thermal lens in the surrounding air is decoded from the interferometric signal using analytical and numerical tools. The boundary/edge effects are found to be relevant to properly describe the interferometric signals. The tools developed in this study provide a framework for the study of finite size effects in heat transport in opaque materials and are applicable to describe not only the phase shift sensed by the interferometer but also to contribute to the photothermal-based technologies employing similar detection mechanisms.


This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in G. A. S. Flizikowski, B. Anghinoni, J. H. Rohling, M. P. Belanon, R. S. Mendes, M. L. Baesso, L. C. Malacarne, T. Poar, S. E. Bialkowski, and N. G. C. Astrath, Influence of edge effects on laser-induced surface displacement of opaque materials by photothermal interferometry, Journal of Applied Physics 128 (2020), no. 4, 044509. and may be found at

Available for download on Thursday, July 29, 2021

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