Control of nanoparticles with arbitrary two-dimensional force fields |
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Authors: | Cohen Adam E |
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Institution: | Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA. acohen@post.harvard.edu |
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Abstract: | 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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