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Acoustique

Quantifying nanoparticle size effect on the photoacoustic generation efficiency

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Authors: Arthur Billon, Sarah Boumati, Lorenzo Mancini, Charaf Eddine Benaddi, Elise Michel, Clément Linger, Colin Schotté, Rachel Méallet, Frédéric Gobeaux, Gilles Clavier, Nicolas Tsapis, Jérôme Gateau

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Photoacoustic (PA) signal generation in colloidal suspensions of optically absorbing nanoparticles is dominated by the thermal expansion of water for gold nanoparticles, but remains mostly unexplored for organic nanoparticles. Here, we derive a model where the PA generation efficiency scales with particle size and thermoelastic contrast with water. The model is validated using solid lipid nanoparticles labeled with several BODIPY dyes. This experimental validation paves the way for quantitative PA characterization of nanomaterials and rational design of PA contrast agents.