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A Microfluidic-based Hydrodynamic Trap for Single Particles
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Indirect optical trapping using light driven micro-rotors for reconfigurable hydrodynamic manipulation.

Unė G Būtaitė1, Graham M Gibson2, Ying-Lung D Ho3

  • 1School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK. u.butaite.1@research.gla.ac.uk.

Nature Communications
|March 16, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces indirect optical trapping using micro-robotics and hydrodynamic forces for precise nanoscale manipulation. This method overcomes limitations of traditional optical tweezers, enabling work with sensitive biological samples and materials previously untrappable.

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Area of Science:

  • Physics
  • Biophysics
  • Nanotechnology

Background:

  • Optical tweezers offer versatile non-contact manipulation of nanoscale objects.
  • Direct laser illumination in optical tweezers limits applications with live biological specimens and certain materials.

Purpose of the Study:

  • To develop an indirect optical trapping platform overcoming limitations of direct illumination.
  • To enable precise nanoscale control of aqueous particles using hydrodynamic forces.

Main Methods:

  • Optically actuated micro-robotics with closed-loop control.
  • Sculpting localized flow-fields by piloting optically-trapped micro-rotors.
  • Indirect manipulation of particles without direct laser illumination.

Main Results:

  • Demonstrated 2D trapping of absorbing particles unsuitable for direct optical trapping.
  • Stabilized position and orientation of live yeast cells.
  • Achieved independent control over multiple aqueous mesoscopic objects simultaneously.

Conclusions:

  • The developed platform expands the capabilities of optical tweezers.
  • Represents a new paradigm for manipulating aqueous mesoscopic systems.
  • Enables manipulation of sensitive biological and material samples previously not possible.