Journal
OPTICS LETTERS
Volume 29, Issue 19, Pages 2231-2233Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.29.002231
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Laser beams have been demonstrated to be capable of exerting torque as well as forces on microparticles. Using a custom magneto-optic manipulator, we directly measured the torque exerted by laser light on absorbing microspheres as a result of the transfer of spin angular momentum. A general method for measuring torque has been developed, and the experimental apparatus has shown a sensitivity of similar to1 pN/nm. (C) 2004 Optical Society of America.
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