Quantum limited particle sensing in optical tweezers

Details Quantum limited particle sensing in optical tweezers Quantum limited particle sensing in optical tweezers

2009-07-24

arxiv.org/abs/0907.4198v1

Physics

Quantum Physics

Submitted to Biophys J

Scientific paper

10.1103/PhysRevA.80.063806

Particle sensing in optical tweezers systems provides information on the position, velocity and force of the specimen particles. The conventional quadrant detection scheme is applied ubiquitously in optical tweezers experiments to quantify these parameters. In this paper we show that quadrant detection is non-optimal for particle sensing in optical tweezers and propose an alternative optimal particle sensing scheme based on spatial homodyne detection. A formalism for particle sensing in terms of transverse spatial modes is developed and numerical simulations of the efficacy of both quadrant and spatial homodyne detection are shown. We demonstrate that an order of magnitude improvement in particle sensing sensitivity can be achieved using spatial homodyne over quadrant detection.

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