Measurement of orbital angular momentum in optical tweezers

Parkin, Simon J. W., Nieminen, Timo A., Heckenberg, Norman R. and Rubinsztein-Dunlop, Halina (2004). Measurement of orbital angular momentum in optical tweezers. In: Kishan Dholakia and Gabriel C. Spalding, Proceedings of SPIE. Optical Trapping and Optical Micromanipulation, Denver, CO, USA, (264-274). 2 August 2004.

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Author Parkin, Simon J. W.
Nieminen, Timo A.
Heckenberg, Norman R.
Rubinsztein-Dunlop, Halina
Title of paper Measurement of orbital angular momentum in optical tweezers
Conference Paper Type Fully Published Paper
Conference name Optical Trapping and Optical Micromanipulation
Conference location Denver, CO, USA
Conference dates 2 August 2004
Proceedings title Proceedings of SPIE
Journal name Optical Trapping and Optical Micromanipulation
Editor Kishan Dholakia
Gabriel C. Spalding
Place published Bellingham, Washington, U.S.A.
Publisher SPIE - International Society for Optical Engineering
Publication date 2004
Volume number 5514
ISSN 0277-786X; 1996-756X
Start page 264
End page 274
Total pages 11
Language eng
Abstract/Summary Several techniques have been proposed and used for the rotation or alignment of microparticles in optical tweezers. In every case the optical torque results from the exchange of angular momentum between the beam and the particle, and, in principle, can be measured by purely optical means. Measurement of this torque could be useful for quantitative measurements in biological systems and is required to measure properties such as viscosity of liquids in microlitre (or less) volumes. Although elongated particles will align with the plane of polarisation, the torque efficiency is low, typically about 0.05 hbar per photon. The use of a beam with an elongated focal spot can increase this torque by a factor of 10-20 times, due to the transfer of orbital angular momentum. We report measurements of the orbital component using an analysing (Laguerre-Gauss) hologram. As a proof of principle experiment, an elliptical beam scattered off a glass rod was simulated on a macroscopic scale. The torque was found to be as much as 0.8 hbar per photon. Microscopic elongated objects have been aligned and rotated in optical tweezers and we plan to make measurements of the torques involved. ©2004 COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Subjects 240400 Optical Physics
240499 Optical Physics not elsewhere classified
780102 Physical sciences
E1
Keyword optical torque
optical tweezers
optical angular momentum
orbital angular momentum
Q-Index Code E1
 
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