A 3‐dimensional time‐resolved photothermal deflection “Mirage” method
Applied Physics Letters
A three-dimensional time-resolved theory and experiment for photothermal deflection spectroscopy is developed. The heat conduction equations for two semi-infinite media consisting of an opaque sample and a fluid are solved considering temperature and energy flux balance conditions for a Gaussian heat source. The time dependent perpendicular deflection signal is calculated and compared to experimental measurements on glassy carbon and copper samples. Excellent agreement with literature values for thermal diffusivity of the samples is found. The transient behavior is analyzed for different coupling fluids.
A 3‐dimensional time‐resolved photothermal deflection “Mirage” method N. G. C. Astrath, L. C. Malacarne, G. V. B. Lukasievicz, H. S. Bernabe, J. H. Rohling, M. L. Baesso, J. Shen and S. E. Bialkowski Applied Physics Letters 100 091908 2012