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Proceedings Paper

Spatial measurement of spurious forces with optical tweezers
Author(s): Ignacio Bordeu; Giovanni Volpe; Juan Pablo Staforelli
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Paper Abstract

The study of diffusion in a crowded and complex environment, such as inside a cell or within a porous medium, is of fundamental importance for science and technology. Combining blinking holographic optical tweezers and sub-pixel video microscopy permits one to study Brownian motion in confined geometries. In this work, in particular, we have studied the Brownian motion of two colloidal particles interacting hydrodynamically with each other. The proximity between the two microspheres induces a space-dependence in the particles diffusion coefficient and, therefore, a spurious drift. We measure this drift and evaluate the magnitude of the spurious force associated with it. We present the optoelectronic tools employed in the experiment and we discuss the experimental results.

Paper Details

Date Published: 18 November 2013
PDF: 6 pages
Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 878509 (18 November 2013); doi: 10.1117/12.2027533
Show Author Affiliations
Ignacio Bordeu, Univ. de Concepción (Chile)
Giovanni Volpe, Bilkent Univ. (Turkey)
Juan Pablo Staforelli, Univ. de Concepción (Chile)


Published in SPIE Proceedings Vol. 8785:
8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications
Manuel Filipe P. C. Martins Costa, Editor(s)

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