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Phys Rev Lett. 2005 Mar 25;94(11):118102. Epub 2005 Mar 22.

Control of nanoparticles with arbitrary two-dimensional force fields.

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Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA.


An anti-Brownian electrophoretic trap is used to create arbitrary two-dimensional force fields for individual nanoscale objects in solution. The trap couples fluorescence microscopy with digital particle tracking and real-time feedback to generate a position-dependent electrophoretic force on a single nanoparticle. The force may vary over nanometer distances and millisecond times and need not be the gradient of a potential. As illustrations of this technique, I study Brownian motion in harmonic, power-law, and double-well potentials.

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