Optical measurement of torque exerted on an elongated object by a noncircular laser beam

Parkin, Simon J., Nieminen, Timo A., Heckenberg, Norman R. and Rubinsztein-Dunlop, Halina (2004-08) Optical measurement of torque exerted on an elongated object by a noncircular laser beam. Physical Review A, 70 2: 023816-1-023816-6.

 
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Author(s) Parkin, Simon J.
Nieminen, Timo A.
Heckenberg, Norman R.
Rubinsztein-Dunlop, Halina
Title Optical measurement of torque exerted on an elongated object by a noncircular laser beam
Journal name Physical Review A
Publication date 2004-08
Sub-type Article
Volume number 70
Issue number 2
ISSN 1050-2947
Start page 023816-1
End page 023816-6
Total pages 6
Place of publication New York, U.S.A.
Publisher American Physical Society through the American Institute of Physics
Language eng
Subject 240504 Electrostatics and Electrodynamics
240400 Optical Physics
Abstract We have developed a scheme to measure the optical torque, exerted by a laser beam on a phase object, by measuring the orbital angular momentum of the transmitted beam. The experiment is a macroscopic simulation of a situation in optical tweezers, as orbital angular momentum has been widely used to apply torque to microscopic objects. A hologram designed to generate LG02 modes and a CCD camera are used to detect the orbital component of the beam. Experimental results agree with theoretical numerical calculations, and the strength of the orbital component suggest its usefulness in optical tweezers for micromanipulation.
Keyword(s) optical angular momentum
orbital angular momentum
optical torque
optical tweezers
micromanipulation
Additional Notes 6 pages, 7 figures.
 
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http://dx.doi.org/10.1103/PhysRevA.70.023816  
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http://prola.aps.org/  
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Created: Mon, 30 Aug 2004, 10:00:00 EST by Timo Nieminen on behalf of School of Mathematics & Physics  -  Detailed History