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Journal Articles Journal of Physical Chemistry C Year : 2020

Ultrafast Thermo-Optical Dynamics of a Single Metal Nano-Object

Michele Diego
Paolo Maioli
Francesco Rossella
Francesco Banfi
Aurelien Crut

Abstract

Single-particle optical spectroscopy methods have enabled quantitative investigations of the optical, electronic, and vibrational responses of nano-objects in the recent years. In this work, single-particle pump–probe optical spectroscopy was exploited to investigate the cooling dynamics of individual gold nanodisks supported on a sapphire substrate. The measured time-resolved signals are shown to directly reflect the temporal evolution of the nanodisk temperature following its sudden excitation. The single-particle character of the experiments enables a quantitative analysis of the amplitudes of the measured time-resolved signals, allowing to rationalize their large probe wavelength dependence. The measured cooling kinetics mainly depends on the nanodisk thickness and to a much lesser extent on the diameter, in agreement with numerical simulations based on Fourier law of heat diffusion, also accounting for the presence of a thermal resistance at the interface between the nanodisks and their substrate. For the explored diameter range (60–190 nm), the nanodisk cooling rate is limited by heat transfer at the gold–sapphire interface, whose thermal conductance can be estimated for each investigated nanodisk.
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Dates and versions

hal-02919819 , version 1 (03-11-2020)

Identifiers

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Romain Rouxel, Michele Diego, Fabio Medeghini, Paolo Maioli, Francesco Rossella, et al.. Ultrafast Thermo-Optical Dynamics of a Single Metal Nano-Object. Journal of Physical Chemistry C, 2020, 124 (28), pp.15625-15633. ⟨10.1021/acs.jpcc.0c04709⟩. ⟨hal-02919819⟩
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