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11 September 2006 Torque transfer in optical tweezers due to orbital angular momentum
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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 transfer efficency for different particle-mode combinations. We present the results of these experiments and discuss some of the difficulties encountered.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Simon J. W. Parkin, Gregor Knöner, Timo A. Nieminen, Norman R. Heckenberg, and Halina Rubinsztein-Dunlop "Torque transfer in optical tweezers due to orbital angular momentum", Proc. SPIE 6326, Optical Trapping and Optical Micromanipulation III, 63261B (11 September 2006);


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