Fluence Threshold for Photothermal Bubble Generation Using Plasmonic Nanoparticles
Résumé
Under nano- to femtosecond pulsed illumination at their plasmonic resonance wavelength, metal
nanoparticles efficiently absorb the incident light energy that is subsequently converted into heat. In a
liquid environment, with sufficiently high pulse fluences (light energy per unit area), this heat generation
may result in the local formation of a transient nanobubble. This phenomenon has been the subject
of a decade of investigations and is at the basis of numerous applications from cancer therapy to photoacoutic
imaging. The aim of this article is to clarify the question of the fluence threshold required
for bubble formation. Using a Runge-Kutta-4 numerical algorithm modeling the heat diffusion around
a spherical gold nanoparticle, we numerically investigate the influence of the nanoparticle diameter,
pulse duration (from the femto- to the nanosecond range), wavelength and Kapitza resistivity in order
to explain the observations reported in the literature.
Domaines
Physique [physics]
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