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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 4 — Apr. 1, 2009

Characterization of anisotropic nano-particles by using depolarized dynamic light scattering in the near field

D. Brogioli, D. Salerno, V. Cassina, S. Sacanna, A. P. Philipse, F. Croccolo, and F. Mantegazza  »View Author Affiliations

Optics Express, Vol. 17, Issue 3, pp. 1222-1233 (2009)

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Light scattering techniques are widely used in many fields of condensed and soft matter physics. Usually these methods are based on the study of the scattered light in the far field. Recently, a new family of near field detection schemes has been developed, mainly for the study of small angle light scattering. These techniques are based on the detection of the light intensity near to the sample, where light scattered at different directions overlaps but can be distinguished by Fourier transform analysis. Here we report for the first time data obtained with a dynamic near field scattering instrument, measuring both polarized and depolarized scattered light. Advantages of this procedure over the traditional far field detection include the immunity to stray light problems and the possibility to obtain a large number of statistical samples for many different wave vectors in a single instantaneous measurement. By using the proposed technique we have measured the translational and rotational diffusion coefficients of rod-like colloidal particles. The obtained data are in very good agreement with the data acquired with a traditional light scattering apparatus.

© 2009 Optical Society of America

OCIS Codes
(100.2960) Image processing : Image analysis
(290.5855) Scattering : Scattering, polarization

ToC Category:

Original Manuscript: December 3, 2008
Revised Manuscript: December 27, 2008
Manuscript Accepted: January 3, 2009
Published: January 21, 2009

Virtual Issues
Vol. 4, Iss. 4 Virtual Journal for Biomedical Optics

D. Brogioli, D. Salerno, V. Cassina, S. Sacanna, A. P. Philipse, F. Croccolo, and F. Mantegazza, "Characterization of anisotropic nano-particles by using depolarized dynamic light scattering in the near field," Opt. Express 17, 1222-1233 (2009)

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