Photofocusing: Light and flow of phototactic microswimmer suspension.
basic_science · Level V
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- Record sourced from PubMed, PMID 27300822.
- Also identified by DOI 10.1103/PhysRevE.93.051101.
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Abstract
We explore in this paper the phenomenon of photofocusing: a coupling between flow vorticity and biased swimming of microalgae toward a light source that produces a focusing of the microswimmer suspension. We combine experiments that investigate the stationary state of this phenomenon as well as the transition regime with analytical and numerical modeling. We show that the experimentally observed scalings on the width of the focalized region and the establishment length as a function of the flow velocity are well described by a simple theoretical model.