Radiation trapping forces on microspheres with optical tweezers

DOI PDF 被引用文献3件
  • W. H. Wright
    Department of Electrical and Computer Engineering,
  • G. J. Sonek
    Department of Electrical and Computer Engineering,
  • M. W. Berns
    Beckman Laser Institute and Medical Clinic, University of California, Irvine, California 92717

書誌事項

公開日
1993-08-09
DOI
  • 10.1063/1.109937
公開者
AIP Publishing

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説明

<jats:p>Axial trapping forces exerted on microspheres are predicted using a Gaussian beam electromagnetic field model and a ray-optics model, and compared with experimental measurements. Ray-optics predicts a maximum trapping efficiency Q= −0.14 for optically trapped polystyrene microspheres in water, compared to a measured value of −0.12 ± 0.014 for 10 μm diam microspheres. When the microspheres are composed of amorphous silica, the predicted ray-optics Q decreases to −0.11, compared to a Q = −0.034 predicted by the electromagnetic field model, and a measured value of −0.012 ± 0.001 for 1 μm diam microspheres. These results indicate that the two models have applicability in two different size regimes, and thus, are complementary.</jats:p>

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