Abstract
Traveling-wave tracking (TWT) is a technique for the study of the motion of submicron-sized particles with a very high spatial and temporal resolutions: the particle can be localized with a subnanometer precision at the microsecond time scale. In this technique, a particle is moving through the traveling interference pattern, and measurements of the intensity and phase of the scattered light allow to precisely determine the particles position. In the present paper we describe the experimental setup and its performances. As an example of use of the TWT, we characterize the Brownian motion of a submicron-sized bead in a confined environment.
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