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Light scattering detection in the near field, a rapidly expanding family ofscattering techniques, has recently proved to be an appropriate procedure forperforming dynamic measurements. Here we report an innovative algorithm, basedon the evaluation of the Exposure Time Dependent Spectrum (ETDS), which makesit possible to measure the fast dynamics of a colloidal suspension with the aidof a simple near field scattering apparatus and a CCD camera. Our algorithmconsists in acquiring static spectra in the near field at different exposuretimes, so that the measured decay times are limited only by the exposure timeof the camera and not by its frame rate. The experimental set-up is based on amodified microscope, where the light scattered in the near field is collectedby a commercial objective, but (unlike in standard microscopes) the lightsource is a He-Ne laser which increases the instrument sensitivity. Theapparatus and the algorithm have been validated by considering model systems ofstandard spherical nano-particle.

optics express

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