Indirect optical trapping using light driven micro-rotors for reconfigurable hydrodynamic manipulation

Unė G. Būtaitė, Graham M. Gibson, Daniel Ho, Mike Taverne, Jonathan M. Taylor, David B. Phillips

Research output: Contribution to journalArticle (Academic Journal)peer-review

32 Citations (Scopus)
312 Downloads (Pure)

Abstract

Optical tweezers are a highly versatile tool for exploration of the mesoscopic world, permitting non-contact manipulation of nanoscale objects. However, direct illumination with intense lasers restricts their use with live biological specimens, and limits the types of materials that can be trapped. Here we demonstrate an indirect optical trapping platform which circumvents these limitations by using hydrodynamic forces to exert nanoscale-precision control over aqueous particles, without directly illuminating them. Our concept is based on optically actuated micro-robotics: closed-loop control enables highly localised flow-fields to be sculpted by precisely piloting the motion of optically-trapped micro-rotors. We demonstrate 2D trapping of absorbing particles which cannot be directly optically trapped, stabilise the position and orientation of yeast cells, and demonstrate independent control over multiple objects simultaneously. Our work expands the capabilities of optical tweezers platforms, and represents a new paradigm for manipulation of aqueous mesoscopic systems.
Original languageEnglish
Article number1215
Number of pages10
JournalNature Communications
Volume10
Issue number1
DOIs
Publication statusPublished - 14 Mar 2019

Keywords

  • Optical manipulation and tweezers
  • Optofluidics
  • Fluid dynamics
  • 3D direct laser writing
  • Two-photon polymerisation

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