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1 March 2011 Photothermal lens spectrometry of metallic nanoparticles colloids
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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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A. Marcano, F. Delima, N. Melikechi, and Y. Markushin "Photothermal lens spectrometry of metallic nanoparticles colloids", Proc. SPIE 7947, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling VIII, 79470D (1 March 2011);

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