Torque transfer in optical tweezers due to orbital angular momentum

Simon J. W. Parkin; Gregor Knöner; Timo A. Nieminen; Norman R. Heckenberg; Halina Rubinsztein-Dunlop

doi:10.1117/12.681402

11 September 2006 Torque transfer in optical tweezers due to orbital angular momentum

Simon J. W. Parkin, Gregor Knöner, Timo A. Nieminen, Norman R. Heckenberg, Halina Rubinsztein-Dunlop

Proceedings Volume 6326, Optical Trapping and Optical Micromanipulation III; 63261B (2006) https://doi.org/10.1117/12.681402
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.681402

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