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Related Experiment Videos

An optically driven pump for microfluidics.

Jonathan Leach1, Hasan Mushfique, Roberto di Leonardo

  • 1Physics and Astronomy, University of Glasgow, Glasgow, UK. j.leach@physics.gla.ac.uk

Lab on a Chip
|June 2, 2006
PubMed
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We developed an optical pump using rotating vaterite particles to generate fluid flow in microfluidic channels. This method allows for controlled flow rates and direction, with potential for integrated lab-on-chip devices.

Area of Science:

  • Microfluidics
  • Optical manipulation
  • Particle physics

Background:

  • Microfluidic devices require precise fluid control for various applications.
  • Traditional pumping methods can be complex and difficult to integrate into micro-scale systems.
  • Optical manipulation offers a non-invasive approach for controlling micro-scale objects and fluids.

Purpose of the Study:

  • To demonstrate a novel optically driven pump for generating fluid flow in microfluidic channels.
  • To investigate the use of birefringent vaterite particles manipulated by optical tweezers for fluid displacement.
  • To develop an integrated optical sensing method for measuring microfluidic flow.

Main Methods:

  • Two counter-rotating birefringent vaterite particles were trapped and driven by optical tweezers using a circularly polarized laser beam.

Related Experiment Videos

  • The transfer of spin angular momentum from the laser beam induced particle rotation, generating fluid flow.
  • A separate optically trapped probe particle was used to measure the magnitude and direction of the fluid flow.

    • Main Results:

    • The optically driven pump successfully generated fluid flow in microchannels at rates up to 200 (microm^3 s^-1).
    • The direction of fluid pumping was reversible by altering the rotation direction of the vaterite beads.
    • The integrated optical sensing method accurately mapped fluid flow characteristics within the channel.

    Conclusions:

    • Optically driven vaterite particles provide an effective method for generating and controlling fluid flow in microfluidics.
    • The developed technique integrates pumping and sensing capabilities, paving the way for advanced microfluidic systems.
    • This approach has significant potential for application in lab-on-chip devices, enabling complex fluidic operations with a single laser beam.