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Optics Letters

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  • Vol. 29, Iss. 19 — Oct. 1, 2004
  • pp: 2231–2233

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

Marco Capitanio, Davide Normanno, and Francesco Saverio Pavone  »View Author Affiliations


Optics Letters, Vol. 29, Issue 19, pp. 2231-2233 (2004)
http://dx.doi.org/10.1364/OL.29.002231


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Abstract

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

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(230.3810) Optical devices : Magneto-optic systems
(230.5440) Optical devices : Polarization-selective devices
(260.2160) Physical optics : Energy transfer

Citation
Marco Capitanio, Davide Normanno, and Francesco Saverio Pavone, "High-precision measurements of light-induced torque on absorbing microspheres," Opt. Lett. 29, 2231-2233 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-19-2231


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