Abstract
The Z-scan technique is used to measure the nonlinear refractive index and the nonlinear absorption coefficient β of ionic magnetic colloids as a function of the nanoparticles’ diameter 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 and β measured in the femtosecond time-scale regime, the third-order susceptibility is calculated and is shown to depend on : the smaller the , the bigger the . A possible origin of the high values of found may be confining effects related to the physical nanoscale of the magnetic particles.
© 2006 Optical Society of America
Full Article | PDF ArticleMore Like This
S. Alves, F. L. Cuppo, and A. M. Figueiredo Neto
J. Opt. Soc. Am. B 23(1) 67-74 (2006)
Daniel Espinosa, Diogo Soga, Sarah Alves, Leonardo De Boni, Sérgio Carlos Zílio, and Antônio Martins Figueiredo Neto
J. Opt. Soc. Am. B 29(3) 280-285 (2012)
D. H. G. Espinosa, C. L. P. Oliveira, and A. M. Figueiredo Neto
J. Opt. Soc. Am. B 35(2) 346-355 (2018)