Photothermal mirror infrared spectroscopy uncovers buried thermal responses in polymers, suggesting deeper analysis techniques for materials.
substrates validate the model, showing excellent agreement between theory and measurement. The results establish PTM-IR as a non-destructive infrared technique capable of probing buried absorbers and determining both absorber and overlayer thicknesses, extending the reach of depth-restricted photothermal techniques toward deeper, non-contact subsurface characterization.
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Zhang et al. (2026) studied this question.
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