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Title: Nonlinear optical properties of ionic magnetic colloids in the femto- and millisecond time scales : change from convergent-to-divergent lens-type behaviors
Authors: Soga, Diogo
Alves, Sarah
Campos, Alex Fabiano Cortez
Tourinho, Francisco Augusto
Depeyrot, Jérôme
Figueiredo Neto, Antonio Martins
Assunto:: Partículas magnéticas
Nanopartículas magnéticas
Issue Date: Jan-2007
Publisher: The Optical Society
Citation: SOGA, Diogo et al. Nonlinear optical properties of ionic magnetic colloids in the femto- and millisecond time scales: change from convergent-to-divergent lens-type behaviors. Optics InfoBases, Washington, v. 24, n. 1, jan., 2007. Disponível em: <http://www.opticsinfobase.org/abstract.cfm?URI=josab-24-1-49>. Acesso em 25 out. 2010.
Abstract: The Z-scan technique is used to measure the nonlinear refractive index n2 and the nonlinear absorption coefficient β of ionic magnetic colloids as a function of the nanoparticles’ diameter (Drx) in the femto- and millisecond time-scale regimes. A change from a convergent-lens type (at a femtosecond time scale) to a divergent-lens type behavior (at a millisecond time scale) is observed. From the values of n2 and β measured in the femtosecond time-scale regime, the third-order susceptibility X(³) is calculated and is shown to depend on Drx: the smaller the Drx, the bigger the X(³). A possible origin of the high values of X(³) found may be confining effects related to the physical nanoscale of the magnetic particles.
Description: 7 f. : il.
Licença:: Este artigo foi publicado na Optics InfoBases e está disponível como um arquivo eletrônico reproduzível com a permissão da OSA. O documento pode ser encontrado na seguinte URL no site da OSA: <http://www.opticsinfobase.org/abstract.cfm?URI=josab-24-1-49>. Reproduções sistemáticas e múltiplas ou distribuição para vários locais através de meios eletrônicos, ou outros são proibidas e estão sujeitas a sanções nos termos da legislação.
DOI: https://dx.doi.org/10.1364/JOSAB.24.000049
Appears in Collections:IF - Artigos publicados em periódicos

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