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A dielectric object irradiated with a strongly focused laser beam is affected by the trapping force as well as the scattering force. When the object is chirally shaped, it can be rotated in a certain direction. Here, we show that the rotational direction is controlled as desired only by changing the position of the focal spot on the same chiral object. We show the experimental evidence of the mode switching by using a helical chromosome under steady illumination of a Nd3+:YAG laser beam.
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Harada et al. (2002) studied this question.
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