Sequence of images, (a)–(f), showing rotation of seven -diameter polystyrene beads for one cycle. Right- and left-hand side images in each frame show two-dimensional trapping due to left- and right-circularly polarized light, respectively. One of the beads in each array is tracked with a black dot.
Rotation rate as a function of the position of the beam focus relative to the coverslip–water interface, in right - and left - circularly polarized light of , where the clockwise rotation is taken to be the positive one. The image of the array became more blurred with increasing above , so the rotation rate in that region is not illustrated.
Rotation rate as a function of the number of two-dimensionally trapped polystyrene beads at laser power of .
Maximum rotation rate of the array of seven -diameter polystyrene beads as a function of the laser power.
Interference patterns with a change in the position of the beam focus: (a) , (b) , and (c) .
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