The cooling dynamics of individual
gold nanodisks synthesized using
colloidal chemistry and deposited on solid substrates with different
compositions and thicknesses were investigated using optical time-resolved
spectroscopy and finite-element modeling. Experiments demonstrate
a strong substrate-dependence of these cooling dynamics, which require
the combination of heat transfer at the nanodisk/substrate interface
and heat diffusion in the substrate. In the case of nanodisks deposited
on a thick sapphire substrate, the dynamics are found to be mostly
limited by the thermal resistance of the gold/sapphire interface,
for which a value similar to that obtained in the context of previous
experiments on sapphire-supported single gold nanodisks produced by
electron beam lithography is deduced. In contrast, the cooling dynamics
of nanodisks supported by nanometric silica and silicon nitride membranes
are much slower and largely affected by heat diffusion in the membranes,
whose efficiency is strongly reduced as compared to the thick sapphire
case.
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