Spatial measurement of spurious forces with optical tweezers
Proceedings of SPIE - The International Society for Optical Engineering
MetadataShow full item record
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/27938
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. © 2013 SPIE.
- Conference Paper 2294
Showing items related by title, author, creator and subject.
Volpe G.; Volpe G.; Gigan, S. (SPIE, 2014)Optical tweezers have been widely used in physics, chemistry and biology to manipulate and trap microscopic and nanoscopic objects. Current optical trapping techniques rely on carefully engineered setups to manipulate ...
Volpe G.; Kurz L.; Callegari, A.; Volpe G.; Gigan, S. (Optical Society of American (OSA), 2014)Current optical manipulation techniques rely on carefully engineered setups and samples. Although similar conditions are routinely met in research laboratories, it is still a challenge to manipulate microparticles when the ...
Volpe G. (2012)The possibility of measuring microscopic forces down to the femtonewton range has opened new possibilities in fields such as biophysics and nanophotonics. I will review some of the techniques most often employed, namely ...