Abstract
Optical tweezers with a low numerical aperture microscope objective is used to manipulate the
microspheres at the water-air interface. In this letter, we determine the optimal optical trap for the lateral
manipulation of microspheres at a water-air interface. The experimental results show that the trapping force
is influenced by the expansion of the trapping beam at the back aperture of the objective. The optimal filling
ratio of 0.65 is suggested for lateral optical manipulation at the water-air interface. The lateral trapping
forces at the water-air interface are theoretically investigated with the ray-optics model. The numerical
results show that the lateral trapping forces can be changed by shrinking the diameter of the trapping laser
beam. The numerical results are in accordance with the experimental results.
© 2014 Chinese Optics Letters
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