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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 9, Iss. 10 — Oct. 1, 1992
  • pp: 1922–1930

Calculation of the trapping force in a strongly focused laser beam

R. Gussgard, T. Lindmo, and I. Brevik  »View Author Affiliations


JOSA B, Vol. 9, Issue 10, pp. 1922-1930 (1992)
http://dx.doi.org/10.1364/JOSAB.9.001922


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Abstract

We present what is, to the best of our knowledge, the first detailed calculation of the reverse trapping force acting on a dielectric sphere when it is illuminated by a strongly focused laser beam. The calculation is carried out within the geometrical optics approximation. The phenomenon of laser trapping was discovered experimentally by Ashkin et al. [Opt. Lett. 11, 288 (1986)] and is of great practical interest in view of the possibility it offers for freely manipulating biological particles, such as viruses and bacteria, in a nondestructive manner. We support our calculations by a qualitative experiment that clearly shows the accessibility of the trapping effect in practice. We use, as an experimental improvement, an objective with a central field stop producing a conical dark field. This enhances the relative contribution from high-N.A. illumination and makes it easier to achieve optical trapping.

© 1992 Optical Society of America

Citation
R. Gussgard, T. Lindmo, and I. Brevik, "Calculation of the trapping force in a strongly focused laser beam," J. Opt. Soc. Am. B 9, 1922-1930 (1992)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-9-10-1922


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References

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