  This paper is devoted to the study of photothermal transformations in
multilayered structures. As a modelled sample, porous silicon with a periodic
distribution of the porosity was chosen. The spatial distribution of the
optical properties inside the structure was evaluated under Brugmann
approximation. The heat sources arising as a result of electromagnetic
radiation absorption in the structure were estimated by solving Maxwell
equations. This allowed us to calculate temperature profiles inside
photo-excited sample. For experimental measurements, photoacoustic set-up with
a gas-microphone transduction system was chosen to investigate thermal
properties of the structure. The results of the photoacoustic response
simulation based on the gas-piston model demonstrated an excellent agreement
with experiments. This allows a reliable evaluation of the thermal conductivity
by fitting the experimental amplitude-frequency photoacoustic signal with the
simulated one.
