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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 25 — Dec. 8, 2008
  • pp: 20272–20282

Nano-particle characterization by using Exposure Time Dependent Spectrum and scattering in the near field methods: how to get fast dynamics with low-speed CCD camera

Doriano Brogioli, Fabrizio Croccolo, Valeria Cassina, Domenico Salerno, and Francesco Mantegazza  »View Author Affiliations

Optics Express, Vol. 16, Issue 25, pp. 20272-20282 (2008)

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Light scattering detection in the near field, a rapidly expanding family of scattering techniques, has recently proved to be an appropriate procedure for performing dynamic measurements. Here we report an algorithm, first suggested by Oh et al. (Phys. Rev. E 69, 21106 (2004)), based on the evaluation of the Exposure Time Dependent Spectrum (ETDS), which makes it possible to measure the fast dynamics of a colloidal suspension with the aid of a simple near field scattering apparatus and a CCD camera. The algorithm consists in acquiring static spectra in the near field at different exposure times, so that the measured decay times are limited only by the exposure time of the camera and not by its frame rate. The experimental set-up is based on a modified microscope, where the light scattered in the near field is collected by a commercial objective, but (unlike in standard microscopes) the light source is a He-Ne laser which increases the instrument sensitivity. The apparatus and the algorithm have been validated by considering model systems of standard spherical nano-particle.

© 2008 Optical Society of America

OCIS Codes
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(180.0180) Microscopy : Microscopy
(290.0290) Scattering : Scattering

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: September 18, 2008
Revised Manuscript: November 6, 2008
Manuscript Accepted: November 13, 2008
Published: November 24, 2008

Doriano Brogioli, Fabrizio Croccolo, Valeria Cassina, Domenico Salerno, and Francesco Mantegazza, "Nano-particle characterization by using exposure time-dependent spectrum and scattering in the near field methods: how to get fast dynamics with low-speed CCD camera," Opt. Express 16, 20272-20282 (2008)

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