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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 1 — Jan. 1, 2007
  • pp: 49–55

Nonlinear optical properties of ionic magnetic colloids in the femto- and millisecond time scales: change from convergent-to-divergent lens-type behaviors

Diogo Soga, Sarah Alves, Alex Campos, Francisco Augusto Tourinho, Jerôme Depeyrot, and Antonio MartinsFigueiredo Neto  »View Author Affiliations


JOSA B, Vol. 24, Issue 1, pp. 49-55 (2007)
http://dx.doi.org/10.1364/JOSAB.24.000049


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Abstract

The Z-scan technique is used to measure the nonlinear refractive index n 2 and the nonlinear absorption coefficient β of ionic magnetic colloids as a function of the nanoparticles’ diameter ( D r x ) 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 n 2 and β measured in the femtosecond time-scale regime, the third-order susceptibility χ ( 3 ) is calculated and is shown to depend on D r x : the smaller the D r x , the bigger the χ ( 3 ) . A possible origin of the high values of χ ( 3 ) found may be confining effects related to the physical nanoscale of the magnetic particles.

© 2006 Optical Society of America

OCIS Codes
(160.0160) Materials : Materials
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4720) Nonlinear optics : Optical nonlinearities of condensed matter

ToC Category:
Nonlinear Optics

History
Original Manuscript: May 26, 2006
Revised Manuscript: August 8, 2006
Manuscript Accepted: August 29, 2006

Citation
Diogo Soga, Sarah Alves, Alex Campos, Francisco Augusto Tourinho, Jerôme Depeyrot, and Antonio Martins Figueiredo Neto, "Nonlinear optical properties of ionic magnetic colloids in the femto- and millisecond time scales: change from convergent-to-divergent lens-type behaviors," J. Opt. Soc. Am. B 24, 49-55 (2007)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-24-1-49

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