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Ablation and optical third-order nonlinearities in Ag nanoparticles

dc.contributor.authorTorres Torres, Carlos
dc.contributor.authorPerea López, Néstor
dc.contributor.authorReyes Esqueda, Jorge Alejandro
dc.contributor.authorRodríguez Fernández, Luis
dc.contributor.authorCrespo Sosa, Alejandro
dc.contributor.authorCheang Wong, Juan Carlos
dc.contributor.authorOliver G., Alicia
dc.identifier.citationTorres-Torres, C., Peréa-López, N., Reyes-Esqueda, J. A., Rodríguez-Fernández, L., Crespo-Sosa, A., Cheang-Wong, J. C., & Oliver, A. (2010). Ablation and optical third-order nonlinearities in Ag nanoparticles. International journal of nanomedicine, 5, 925–932. doi:10.2147/IJN.S12463
dc.description.abstract"The optical damage associated with high intensity laser excitation of silver nanoparticles (NPs) was studied. In order to investigate the mechanisms of optical nonlinearity of a nanocomposite and their relation with its ablation threshold, a high-purity silica sample implanted with Ag ions was exposed to different nanosecond and picosecond laser irradiations. The magnitude and sign of picosecond refractive and absorptive nonlinearities were measured near and far from the surface plasmon resonance (SPR) of the Ag NPs with a self-diffraction technique. Saturable optical absorption and electronic polarization related to self-focusing were identified. Linear absorption is the main process involved in nanosecond laser ablation, but nonlinearities are important for ultrashort picosecond pulses when the absorptive process become significantly dependent on the irradiance. We estimated that near the resonance, picosecond intraband transitions allow an expanded distribution of energy among the NPs, in comparison to the energy distribution resulting in a case of far from resonance, when the most important absorption takes place in silica. We measured important differences in the ablation threshold and we estimated that the high selectiveness of the SPR of Ag NPs as well as their corresponding optical nonlinearities can be strongly significant for laser-induced controlled explosions, with potential applications for biomedical photothermal processes."
dc.publisherDove Press Ltd
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional
dc.subjectNonlinear optics
dc.subjectLaser irradiation
dc.subjectMetallic nanoparticles
dc.subjectKerr effect
dc.subjectNonlinear optical
dc.subject.classificationCIENCIAS TECNOLÓGICAS
dc.titleAblation and optical third-order nonlinearities in Ag nanoparticles
dc.rights.accessAcceso Abierto

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