We evaluate a method of detecting buried light-absorbing layers using infrared measurement of surface temperature following pulsed laser irradiation. Temporal signals are converted to spatial signals by solving a Fredholm integral equation. Results from layered samples are compared with theory to assess the precision and sensitivity of the technique.
U. S. Sathyam and S. A. Prahl. Pulsed photothermal radiometry of buried light-absorbing layers. Bull. Am. Physical Society, 1995.