Abstract
The near-field photoacoustics of gold nanoparticle in water has received much attention for its biomedical applications and is strongly affected by the gold-water interfacial thermal resistance. However, the effect of interfacial thermal resistance on near-field photoacoustics has been very little studied. Here we present the numerical simulations of near-field photoacoustic signal generation from a single gold nanorod in water by considering different thermal resistances at the gold-water interface. It is shown that, different from the reported reduction of far-field photoacoustic signals by interfacial thermal resistance, enhancement of near-field photoacoustic signals is obtained with the typical gold-water interfacial thermal resistance. Further analysis reveals that the higher rate of net heat transfer to the surrounding water at the typical interfacial thermal resistance, which corresponds to faster thermal expansion of the surrounding water, accounts for such enhancement of near-field photoacoustic signal and that the enhancement of near-field photoacoustic amplitude is mainly present at a distance within thermal diffusion length.
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