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The excitation of plasmonic nanoparticles by ultrashort laser pulses sets inmotion a complex ultrafast relaxation process involving the gradualre-equilibration of the system's electron gas, lattice and environment. One ofthe major hurdles in studying these processes is the lack of directmeasurements of the dynamic temperature evolution of the system subcomponents.We measured the dynamic optical response of ensembles of plasmonic Aunanoparticles following ultrashort-pulse excitation and we compared it with thecorresponding static optical response as a function of the increasingtemperature of the thermodynamic bath. Evaluating the two sets of data, theoptical fingerprints of equilibrium or off-equilibrium responses could beclearly identified, allowing us to extract a dynamic thermometric calibrationscale of the relaxation process, yielding the experimental ultrafasttemperature evolution of the plasmonic particles as a function of time.

Thermometric Calibration of the Ultrafast Relaxation Dynamics in Plasmonic Au Nanoparticles