Thermometric Calibration of the Ultrafast Relaxation Dynamics in Plasmonic Au Nanoparticles

• DOI: 10.1021/acsphotonics.9b01605
• Publication Date: 2020-03-02T19:43:00Z
• Authors: Marzia Ferrera; Giuseppe Della Valle; Maria Sygletou; Michele Magnozzi; Daniele Catone; Patrick O’Keeffe; Alessandra Paladini; Francesco Toschi; Lorenzo Mattera; Maurizio Canepa; Francesco Bisio
• Keywords: Plasmonic Nanoparticles

The excitation of plasmonic nanoparticles by ultrashort laser pulses sets in motion a complex ultrafast relaxation process involving the gradual re-equilibration system's electron gas, lattice, and environment. One major hurdles studying these processes is lack direct measurements dynamic temperature evolution system subcomponents. We measured optical response ensembles Au following ultra-short-pulse excitation, we compared it with corresponding static as function increasing thermodynamic bath. Evaluating two data, fingerprints equilibrium or off-equilibrium responses could be clearly identified, allowing us to extract thermometric calibration scale process, yielding experimental particles time.