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Optical application and measurement of torque on microparticles of isotropic nonabsorbing material

Optical application and measurement of torque on microparticles of isotropic nonabsorbing material We show how it is possible to controllably rotate or align microscopic particles of isotropic nonabsorbing material in a TEM 00 Gaussian beam trap, with simultaneous measurement of the applied torque using purely optical means. This is a simple and general method of rotation, requiring only that the particle is elongated along one direction. Thus, this method can be used to rotate or align a wide range of naturally occurring particles. The ability to measure the applied torque enables the use of this method as a quantitative tool—the rotational equivalent of optical tweezers based force measurement. As well as being of particular value for the rotation of biological specimens, this method is also suitable for the development of optically driven micromachines. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Optical application and measurement of torque on microparticles of isotropic nonabsorbing material

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References (60)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2003 The American Physical Society
ISSN
1094-1622
DOI
10.1103/PhysRevA.68.033802
Publisher site
See Article on Publisher Site

Abstract

We show how it is possible to controllably rotate or align microscopic particles of isotropic nonabsorbing material in a TEM 00 Gaussian beam trap, with simultaneous measurement of the applied torque using purely optical means. This is a simple and general method of rotation, requiring only that the particle is elongated along one direction. Thus, this method can be used to rotate or align a wide range of naturally occurring particles. The ability to measure the applied torque enables the use of this method as a quantitative tool—the rotational equivalent of optical tweezers based force measurement. As well as being of particular value for the rotation of biological specimens, this method is also suitable for the development of optically driven micromachines.

Journal

Physical Review AAmerican Physical Society (APS)

Published: Sep 1, 2003

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