Mr. Avinash Kumar Profile

Avinash Kumar

Student at Simon Fraser Univ

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Proceedings Article | 7 September 2018 Paper

Optical feedback tweezers

Avinash Kumar, John Bechhoefer

Proceedings Volume 10723, 107232J (2018) https://doi.org/10.1117/12.2323837

KEYWORDS: Particles, Optical tweezers, Calibration, Objectives, Modulation, Photodiodes, Beam splitters, Cameras, Field programmable gate arrays, Acousto-optics

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Feedback traps can manipulate particles arbitrarily. In a feedback trap, a position detector detects the particle’s position, a computer calculates the necessary force to be applied based on the position in the “virtual potential,” which is applied to the particle. The process is repeated with as fast a loop rate as practical. Previous feedback traps have used electrokinetic or hydrodynamic forces to manipulate particles. Here, an optical trap creates the force used by the feedback trap to impose arbitrary potentials. We create feedback forces on optically trapped particles by moving the trap position rapidly in response to observed fluctuations with the help of an acoustooptic deflector (AOD). In preliminary experiments, we have confined a 1.5 μm silica bead in a virtual potential that is 35-40 times stiffer than the underlying optical trap, whose laser power is kept constant. We also create a virtual double-well potential with independent control over the well separation and barrier height, which is impossible to do with time-sharing optical tweezers.

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