ph9b01605_si_001.pdf (4.82 MB)
Thermometric Calibration of the Ultrafast Relaxation Dynamics in Plasmonic Au Nanoparticles
journal contribution
posted on 2020-03-10, 18:23 authored by Marzia Ferrera, Giuseppe Della Valle, Maria Sygletou, Michele Magnozzi, Daniele Catone, Patrick O’Keeffe, Alessandra Paladini, Francesco Toschi, Lorenzo Mattera, Maurizio Canepa, Francesco BisioThe
excitation of plasmonic nanoparticles by ultrashort laser pulses
sets in motion a complex ultrafast relaxation process involving the
gradual re-equilibration of the system’s electron gas, lattice,
and environment. One of the major hurdles in studying these processes
is the lack of direct measurements of the dynamic
temperature evolution of the system subcomponents. We measured the
dynamic optical response of ensembles of plasmonic Au nanoparticles
following ultra-short-pulse excitation, and we compared it with the
corresponding static optical response as a function of the increasing
temperature of the thermodynamic bath. Evaluating the two sets of
data, the optical fingerprints of equilibrium or off-equilibrium responses
could be clearly identified, allowing us to extract a dynamic thermometric
calibration scale of the relaxation process, yielding the experimental
ultrafast temperature evolution of the plasmonic particles as a function
of time.
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functiontemperature evolutionsystem subcomponentsplasmonic particlesoff-equilibrium responsesplasmonic nanoparticlesultrafast temperature evolutionultrafast relaxation processUltrafast Relaxation Dynamicscalibration scalerelaxation processultra-short-pulse excitationThermometric Calibrationultrashort laser pulses sets
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