ArticleNature communications2023
Hydrodynamic spin-orbit coupling in asynchronous optically driven micro-rotors.
Article in Nature communications, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
What it found
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Who cites it
6 citing papers in PubMed.
- Observation of helical pulses.Nature communications · 2025Article
- Hydrodynamic spin-pairing and active polymerization of oppositely spinning rotors.Nature communications · 2025Article
- A geometric condition for robot-swarm cohesion and cluster-flock transition.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Harnessing Photon Recoil for Enhanced Torque on Light-Driven Metarotors.Nano letters · 2025Article
- The 2025 motile active matter roadmap.Journal of physics. Condensed matter : an Institute of Physics journal · 2025Review
- Transverse optical gradient force in untethered rotating metaspinners.Light, science & applications · 2025Article
Corrections and comments
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Authors and funding
3 authors.
Funding
Abstract
Vortical flows of rotating particles describe interactions ranging from molecular machines to atmospheric dynamics. Yet to date, direct observation of the hydrodynamic coupling between artificial micro-rotors has been restricted by the details of the chosen drive, either through synchronization (using external magnetic fields) or confinement (using optical tweezers). Here we present a new active system that illuminates the interplay of rotation and translation in free rotors. We develop a non-tweezing circularly polarized beam that simultaneously rotates hundreds of silica-coated birefringent colloids. The particles rotate asynchronously in the optical torque field while freely diffusing in the plane. We observe that neighboring particles orbit each other with an angular velocity that depends on their spins. We derive an analytical model in the Stokes limit for pairs of spheres that quantitatively explains the observed dynamics. We then find that the geometrical nature of the low Reynolds fluid flow results in a universal hydrodynamic spin-orbit coupling. Our findings are of significance for the understanding and development of far-from-equilibrium materials.
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Registered trials
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