Abstract
In the last years there has been a growing interest in the application of photothermal techniques to samples with nonflat surfaces, in particular cylinders and spheres. In this work the surface temperature oscillation of multilayered spherical samples which are heated by a modulated light beam is calculated by using the quadrupole method. Several illumination geometries have been studied. Moreover, the lack of adherence between layers, as well as heat losses at the surface, has been considered in the model. This theoretical approach allows photothermal techniques to be used to characterize the thermal properties of spherical samples with continuously varying in-depth thermal conductivity.
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