Abstract

Fourier transform infrared photoacoustic spectroscopy was applied to the nondestructive detection of subsurface layer of bilayered films. Spectral separation of the subsurface layer was carried out by the application of the subtraction technique to the photoacoustic amplitude spectra of bilayered films whose top layer has various values in thickness. As a result, it was found that the spectrum corresponding to the subsurface layer could be separated, and that the photoacoustic depth profiling was possible as far as the depth, which is approximately half the value of the thermal diffusion length.

Photoacoustic phase-controlled Fourier-transform infrared spectroscopy

Santeri Larnimaa, Mikhail Roiz, and Markku Vainio
Opt. Continuum 2(3) 564-578 (2023)

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Peter R. Griffiths
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Lixian Liu, Andreas Mandelis, Huiting Huan, and Kirk H. Michaelian
Opt. Lett. 42(7) 1424-1427 (2017)

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