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High-precision measurements of light-induced torque on absorbing microspheres Export

by: M. Capitanio, D. Normanno, F. S. Pavone
Opt. Lett., Vol. 29, No. 19. (2004), pp. 2231-2233.

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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 ?1 pN/nm. © 2004 Optical Society of America.


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