Photothermal dynamic elastic bending method

A quantitative analysis of the dynamic Plastic bending contribution to the photothermal and photoacoustic signal was done. The photothermal and photoa coustic effects were investigated as a function of modulation frequency inc luding the generation and propagation processes of the plasma, thermal and elastic waves. The theoretical model for a typical detection configuration was given and the relations for elastic bending were derived by the dynamic theory of the thin plate. Analysis showed that the dynamic thermoelastic a nd electronic deformation mechanisms could significantly change the phototh ermal and photoacoustic signal, especially near to the mechanical resonant frequencies of the sample.