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

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

2003-09-30

arxiv.org/abs/physics/0309122v1

Physical Review A 68, 033802 (2003)

Physics

Optics

8 pages, 6 figures

Scientific paper

10.1103/PhysRevA.68.033802

We show how it is possible to controllably rotate or align microscopic particles of isotropic nonabsorbing material in a TEM00 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.

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