Abstract

Photoacoustic Fourier transform infrared spectroscopy (PA/FT-IR) is used to study films of poly(vinylidine fluoride) (PVF₂) and poly(ethylene terephthalate) (PET). It is shown that PVF₂ films over PET change the thermal diffusion length such that the sample PVF₂-on-PET becomes optically transparent and thermally thick. By changing the mirror velocity of the Michelson interferometer it is possible to obtain spectra at various sample depths. The intensity of the carbonyl band of the lower PET film changes as a function of the mirror velocity. The log-log plot of these quantities gives a slope of −3/2, which agrees with theoretical predictions for thermally thick and optically transparent samples.

Photoacoustic phase-controlled Fourier-transform infrared spectroscopy

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

Pyroelectric PVF₂ infrared detector arrays

U. Korn, Z. Rav-Noy, and S. Shtrikman
Appl. Opt. 20(11) 1980-1982 (1981)

Quantitative Fourier transform IR photoacoustic spectroscopy of condensed phases

Y. C. Teng and B. S. H. Royce
Appl. Opt. 21(1) 77-80 (1982)

Depth profiling of ion implanted materials with skewed doping distributions using Fourier transform infrared spectroscopy

Charalambos C. Katsidis
Appl. Opt. 47(2) 213-223 (2008)

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S. McGovern, B. S. H. Royce, and J. Benziger
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