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, λ = 532 nm, and pulsed IR laser irradiation, λ = 10.6 μm (VIS–IR double laser irradiation), has been studied in the temperature interval of 0.2–50°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 (τ = 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.