Phys. Rev. Lett. 94, 118102 (2005) [4 pages]Control of Nanoparticles with Arbitrary Two-Dimensional Force Fields
See accompanying Physics Focus 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.118102
DOI:
10.1103/PhysRevLett.94.118102
PACS:
87.15.Vv, 87.15.Tt, 87.80.Cc
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