We report on pump-probe mode-mismatched photothermal lens experiments of metallic nanoparticles water solutions.
We show that metallic nanoparticles colloids exhibit nonlinear absorption effects related to attraction or repulsion forces
that result from the interaction with the electromagnetic radiation. Gold and iron oxide nanoparticles show a double
peak Z-scan shape that is associated to the presence of attraction forces. We calibrate the experiment using the linear
absorption values of the samples obtaining their corresponding nonlinear absorption coefficients.
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