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{sub 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 tha...

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Veröffentlicht in:	Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2003-09, Vol.68 (3), Article 033802
Hauptverfasser:	Bishop, Alexis I., Nieminen, Timo A., Heckenberg, Norman R., Rubinsztein-Dunlop, Halina
Format:	Artikel
Sprache:	eng
Schlagworte:	ABSORPTION ATOMIC AND MOLECULAR PHYSICS ELECTROMAGNETIC RADIATION PARTICLES RADIATION PRESSURE ROTATION TORQUE TRAPS
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creator	Bishop, Alexis I. Nieminen, Timo A. Heckenberg, Norman R. Rubinsztein-Dunlop, Halina
description	We show how it is possible to controllably rotate or align microscopic particles of isotropic nonabsorbing material in a TEM{sub 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.
doi_str_mv	10.1103/PhysRevA.68.033802
format	Article
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subjects	ABSORPTION ATOMIC AND MOLECULAR PHYSICS ELECTROMAGNETIC RADIATION PARTICLES RADIATION PRESSURE ROTATION TORQUE TRAPS
title	Optical application and measurement of torque on microparticles of isotropic nonabsorbing material
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