Real-time control of optical tweezers

Anders E. Wallin; Heikki Ojala; Anders Korsbäck; Edward Haeggström; Roman Tuma

doi:10.1117/12.737269

5 September 2007 Real-time control of optical tweezers

Anders E. Wallin, Heikki Ojala, Anders Korsbäck, Edward Haeggström, Roman Tuma

Proceedings Volume 6644, Optical Trapping and Optical Micromanipulation IV; 66441Y (2007) https://doi.org/10.1117/12.737269
Event: NanoScience + Engineering, 2007, San Diego, California, United States

Abstract

Optically trapped microshperes can be manipulated by steering the trap beam, while the object position is measured with sub-nanometer resolution. A fast steering system is required to create feedback loop for measurements at a constant force or to increase position detection precision by trap stiffening. Using a real-time re-programmable digital signal processor, we combine steering and position detection to create a fast and versatile closed-loop feedback controlled instrument. We describe the construction and calibration of the instrument. We show that a proportional gain position-clamp algorithm can achieve about 10-fold increase in effective trap stiffness while higher gains lead to unwanted resonances.

Citation Download Citation

Anders E. Wallin, Heikki Ojala, Anders Korsbäck, Edward Haeggström, and Roman Tuma "Real-time control of optical tweezers", Proc. SPIE 6644, Optical Trapping and Optical Micromanipulation IV, 66441Y (5 September 2007); https://doi.org/10.1117/12.737269

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