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Control of Nanoparticles with Arbitrary Two-Dimensional Force Fields

Adam E. Cohen
Phys. Rev. Lett. 94, 118102 – Published 22 March 2005
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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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  • Received 16 December 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.118102

©2005 American Physical Society

Authors & Affiliations

Adam E. Cohen*

  • Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, California 94305, USA

  • *Electronic address: acohen@post.harvard.edu

See Also

Hold Still

Davide Castelvecchi
Phys. Rev. Focus 15, 10 (2005)

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Issue

Vol. 94, Iss. 11 — 25 March 2005

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