Measurement of angular momentum flux in optical tweezers

Rubinsztein-Dunlop, Halina, Asavei, Theodor, Preece, Daryl, Stilgoe, Alexander B., Heckenberg, Norman R. and Nieminen, Timo A. (2011). Measurement of angular momentum flux in optical tweezers. In: David L. Andrews, Enrique J. Galvez and Jesper Glückstad, Proceedings of SPIE - The International Society for Optical Engineering. Conference on Complex Light and Optical Forces V, San Francisco, CA, United States, (79500I.1-79500I.13). 26-27 January 2011. doi:10.1117/12.886221

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Author Rubinsztein-Dunlop, Halina
Asavei, Theodor
Preece, Daryl
Stilgoe, Alexander B.
Heckenberg, Norman R.
Nieminen, Timo A.
Title of paper Measurement of angular momentum flux in optical tweezers
Conference name Conference on Complex Light and Optical Forces V
Conference location San Francisco, CA, United States
Conference dates 26-27 January 2011
Proceedings title Proceedings of SPIE - The International Society for Optical Engineering   Check publisher's open access policy
Journal name Complex Light and Optical Forces V   Check publisher's open access policy
Place of Publication Bellingham, WA, United States
Publisher S P I E - International Society for Optical Engineering
Publication Year 2011
Sub-type Fully published paper
DOI 10.1117/12.886221
Open Access Status File (Publisher version)
ISBN 9780819484871
ISSN 0277-786X
Editor David L. Andrews
Enrique J. Galvez
Jesper Glückstad
Volume 7950
Start page 79500I.1
End page 79500I.13
Total pages 13
Collection year 2012
Language eng
Abstract/Summary It is well established that a light beam can carry angular momentum and therefore when using optical tweezers it is possible to exert torques to twist or rotate microscopic objects. Both spin and orbital angular momentum can be transferred. This transfer can be achieved using birefringent particles exposed to a Gaussian circularly polarized beam. In this case, a transfer of spin angular momentum will occur. The change in spin, and hence the torque, can be readily measured optically. On the other hand, it is much more challenging to measure orbital angular momentum and torque. Laguerre-Gauss mode decomposition, as used for orbital angular momentum encoding for quantum communication, and rotational frequency shift can be used, and are effective methods in a macro-environment. However, the situation becomes more complicated when a measurement is done on microscale, especially with highly focused laser beams. We review the methods for the measurement of the angular momentum of light in optical tweezers, and the challenges faced when measuring orbital angular momentum. We also demonstrate one possible simple method for a quantitative measurement of the orbital angular momentum in optical tweezers.
Keyword Optical tweezers
Optical torque
Optical angular momentum
Orbital angular momentum
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Mathematics and Physics
Official 2012 Collection
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Created: Tue, 17 Jan 2012, 13:18:45 EST by Jo Hughes on behalf of School of Mathematics & Physics