Abstract
An efficient and inexpensive method that uses a glass plate mounted onto a
motorized rotating stage as a beam-steering device for the generation of dynamic
optical traps is reported. Force analysis reveals that there are drag and trapping
forces imposed on the bead in the opposite directions, respectively, in a viscous
medium. The trapped bead will be rotated following the beam's motion before it
reaches the critical escape velocity when the drag force is equal to the optical
trapping force. The equilibrium condition facilitates the experimental measurement
of the drag force with potential extensions to the determination of the viscosity of
the medium or the refractive index of the bead. The proposed technique can easily be
integrated into conventional optical microscopic systems with minimum modifications.
© 2011 Chinese Optics Letters
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