Static component of photothermal response in non-transparent samples

Abstract

The paper presents the analysis of the static component of temperature distribution in non-transparent samples during photothermal measurements. Analytical expressions for static part of temperature distribution in the irradiated sample and in its surroundings are determined using one dimensional model of heat transfer in a typical photothermal environment. It is established that the dominant factors that influence the shape and the mean value of the temperature distribution are optical absorption coefficient and thermal conductances of the sample and the surroundings. Important special cases are described and analytical expressions for temperatures of the front and the back side of the sample are derived.

Influence of non-irradiated surface optical absorber on temperature gradient induced by photothermal effect in a thin film

“…Photothermal (PT), and consequently photoacoustic (PA) techniques, are based on direct or indirect measurement of phenomena resulting from heat transfer processes in the examined material, whereas the most straightforward approach considers the examination of surface temperature variations of the sample (Popovic et al, 2018(Popovic et al, , 2021. Since these experimental techniques are considered model-dependent, their development largely involves the development and the analysis of theoretical-mathematical models which link physical processes in the examined material and the measured signal (Dramićanin et al, 2000;Galovic et al, , 2014Galović and Dramićanin, 1999;Markushev et al, 2019;Nesic et al, 2016;Nesic, Galovic, et al, 2012;Nesic, Gusavac, et al, 2012;Popovic et al, 2021) (Aleksić et al, 2022;Djordjevic et al, 2022;Markushev et al, 2018Markushev et al, , 2020Popovic et al, 2009;Somer et al, 2013;Soskic et al, 2012Soskic et al, , 2016Todorović, 2003;Todorović and Nikolic, 2000).…”