Simultaneous measurements of electrophoretic and dielectrophoretic forces using optical tweezers.

  title={Simultaneous measurements of electrophoretic and dielectrophoretic forces using optical tweezers.},
  author={Giuseppe Pesce and Giulia Rusciano and Gianluigi Zito and Antonio Sasso},
  journal={Optics express},
  volume={23 7},
Herein, charged microbeads handled with optical tweezers are used as a sensitive probe for simultaneous measurements of electrophoretic and dielectrophoretic forces. We first determine the electric charge carried by a single bead by keeping it in a predictable uniform electric field produced by two parallel planar electrodes, then, we examine same bead's response in proximity to a tip electrode. In this case, besides electric forces, the bead simultaneously experiences non-negligible… 

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