Feedback localization of freely diffusing fluorescent particles near the optical shot-noise limit
- 23 December 2006
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 32 (2), 145-147
- https://doi.org/10.1364/ol.32.000145
Abstract
We report near-optimal tracking of freely diffusing fluorescent particles in a quasi-two-dimensional geometry via photon counting and real-time feedback. We present a quantitative statistical model of our feedback network and find excellent agreement with the experiment. We monitor the motion of a single fluorescent particle with a sensitivity of while collecting fewer than . Fluorescent microspheres (diffusion coefficient ) are tracked with a root-mean-square tracking error of , within a factor of 2 of the theoretical limit set by photon counting shot noise.
Keywords
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