Abstract
Transverse trapping force on three types of metallic Mie particles
(gold, nickel, and silver) is measured for different values of the
numerical aperture of an objective used for trapping. The
experimental results are compared with those calculated with a modified
ray-optics model. It is found that, unlike the situation for a
trapped dielectric particle, the maximum transverse trapping efficiency
for a trapped metallic particle is increased with the numerical
aperture of the trapping objective. After consideration of
radiometric force, which is caused by the heating effect, and spherical
aberration, which is induced by the refractive-index mismatch, the
measured results agree well with the theoretical prediction. The
magnitude of the radiometric force is approximately ten times stronger
than the maximum transverse trapping force.
© 1999 Optical Society of America
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