High trapping forces for high-refractive index particles trapped in dynamic arrays of counterpropagating optical tweezers.

@article{Horst2008HighTF,
  title={High trapping forces for high-refractive index particles trapped in dynamic arrays of counterpropagating optical tweezers.},
  author={Astrid van der Horst and Peter D J van Oostrum and Alexander Moroz and Alfons van Blaaderen and Marileen Dogterom},
  journal={Applied optics},
  year={2008},
  volume={47 17},
  pages={
          3196-202
        }
}
We demonstrate the simultaneous trapping of multiple high-refractive index (n > 2) particles in a dynamic array of counterpropagating optical tweezers in which the destabilizing scattering forces are canceled. These particles cannot be trapped in single-beam optical tweezers. The combined use of two opposing high-numerical aperture objectives and micrometer-sized high-index titania particles yields an at least threefold increase in both axial and radial trap stiffness compared to silica… CONTINUE READING

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