Abstract
We study the thermal response of a single spherical metal nanoparticle to continuous wave illumination as a function of its size. We show that the particle temperature increases nonmonotonically as the particle size increases, indicating that the photothermal response can be optimized by tuning the particle size and illumination wavelength. We also compare the size-dependence of the photothermal effects of gold and silver nanoparticles and find somewhat surprisingly that Ag nanoparticles are more efficient heat generators only for sufficiently small sizes. These results have importance for applications such as plasmon-assisted photocatalysis, photothermal cancer therapy, etc. and provide a first step toward the study of the size-dependence of the thermo-optic nonlinearity of metal nanospheres.
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