Torque transfer in optical tweezers due to orbital angular momentum

Parkin, S. J. W., Knoener, G., Nieminen, Timo A., Heckenberg, N. R. and Rubinsztein-Dunlop, H. (2006). Torque transfer in optical tweezers due to orbital angular momentum. In: Kishan Dholakia and Gabriel C. Spalding, SPIE International Society of Optical Engineering, San Diego, CA, U.S.A., (63261B-1-63261B-8). 13-17 August 2006. doi:10.1117/12.681402

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Author Parkin, S. J. W.
Knoener, G.
Nieminen, Timo A.
Heckenberg, N. R.
Rubinsztein-Dunlop, H.
Title of paper Torque transfer in optical tweezers due to orbital angular momentum
Conference name SPIE International Society of Optical Engineering
Conference location San Diego, CA, U.S.A.
Conference dates 13-17 August 2006
Journal name Proceedings of SPIE - The International Society for Optical Engineering   Check publisher's open access policy
Place of Publication Bellingham, WA, U.S.A.
Publisher S P I E - International Society of Optical Engineering
Publication Year 2006
Sub-type Fully published paper
DOI 10.1117/12.681402
Open Access Status File (Publisher version)
ISBN 978-081946405-7
ISSN 0277-786X
Editor Kishan Dholakia
Gabriel C. Spalding
Volume 6326
Start page 63261B-1
End page 63261B-8
Total pages 8
Collection year 2006
Language eng
Abstract/Summary We describe two methods to optically measure the torque applied by the orbital angular momentum of the trapping beam in an optical tweezers setup. The first decomposes the beam into orbital angular momentum carrying modes and measures the power in each mode to determine the change in angular momentum of the beam. The second method is based on a measuring the torque transfer due to spin angular momentum and the linear relationship between rotation rate and applied torque to determine the orbital angular momentum transfer. The second method is applied to measuring the tranfer efficiency for different particle-mode combinations. We present the results of these experiments and discuss some of the difficulties encountered.
Subjects 240504 Electrostatics and Electrodynamics
240400 Optical Physics
Keyword Optical tweezers
Optical torque
Orbital angular momentum
Trapping beam
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Created: Mon, 23 Oct 2006, 10:00:00 EST by Timo Nieminen on behalf of School of Mathematics & Physics