Thermal nonlinear optical properties of iron oxide nanoparticles

Daniel Arranz^{1, 2, 3}, Oscar Pérez-Benito², Victor Pérez-Alonso², Patricia de la Presa^{1, 3} and Rosa Weigand^2
1Instituto de Magnetismo Aplicado Salvador Velayos (UCM-ADIF-CSIC), A6 km. 22.5 Las Rozas (Madrid)
²Dpto. de Óptica, ³Dpto. de Física de Materiales, Facultad de Ciencias Físicas,
Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain.

Dedicated to Prof Maria J Yzuel

Iron oxide nanoparticles (IONPs) of magnetite (d = 27 nm) and maghemite (d = 11 nm) have been synthesized using co-precipitation methods. The samples have been characterized by XRD, TEM and SQUID magnetometry. These IONPs are able to release heat under infrared laser radiation, which have interesting biomedical applications. The nonlinear Kerr index n₂ of thermal origin was measured using the Z-scan technique with a continuous-wave He-Ne laser. The results show that magnetite water suspensions have a higher value of n₂ than the maghemite suspensions. Also a parabolic lens model for the transmittance in the closed-aperture geometry provided better fits to the experimental results, than the standard and the aberrated lens models. © Anita Publications. All rights reserved.
Keywords: Z-scan, Thermal Kerr effect, Iron oxide nanoparticles.

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Method: Single- anonymous; Screened for Plagiarism? Yes
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