Heat transfer in a water drop containing a dye and nanoparticles under double laser irradiation

Heat transfer in a water drop containing eosine and ablation silver nanoparticles induced by stationary visible laser irradiation, $\lambda$ = 532 nm, and pulsed IR laser irradiation, $\lambda$ = 10.6 $\mu$m (VIS–IR double laser irradiation), has been studied in the temperature interval of 0.2 – 50$^\circ$C. It has been found that the vibratory system of triplet states in a dye molecule heats up after VIS–IR laser irradiation, causing thermoluminescence. The thermoluminescence decay kinetics indicates a new distribution of electron vibration modes in the fluorescence spectrum of dye molecules. If the drop with nanoparticles is small ($d<$ 1 mm), pulsed IR irradiation ($\tau$ = 50 ms) gives rise to a thermal front causing thermoluminescence, which travels in the drop with a velocity of 0.85 cm/s. Heat transfer in the drop during the formation of a thermal wave has been simulated.