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Optofluidic trapping and transport on solid core waveguides within a microfluidic device.

Bradley S Schmidt, Allen H Yang, David Erickson

    Optics Express
    |June 25, 2009
    PubMed
    Summary

    This study introduces an optofluidic system for dynamic particle trapping and transport using light and microfluidics. The integrated architecture successfully manipulates particles with light forces, demonstrating controlled movement.

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    Area of Science:

    • Optofluidics
    • Microfluidics
    • Photonics
    • Nanotechnology

    Background:

    • Optofluidic manipulation offers precise control over microparticles.
    • Integrating waveguides with microfluidic channels is key for advanced particle handling.

    Purpose of the Study:

    • To demonstrate an integrated microfluidic/photonic architecture for dynamic optofluidic trapping and transport.
    • To characterize particle-size dependence on optical forces in such devices.

    Main Methods:

    • Fabrication of integrated SU-8 polymer waveguides and poly(dimethylsiloxane) (PDMS) microfluidic channels.
    • Utilizing the evanescent field of solid core waveguides for particle manipulation.
    • Characterizing particle propulsion and attraction forces.

    Main Results:

    • Achieved dynamic optofluidic trapping and transport of particles.
    • Demonstrated particle attraction to the waveguide surface and propulsion along the optical path.
    • Observed particle velocities up to 28 µm/s for 3 µm polystyrene spheres with 53.5 mW optical power.
    • Characterized the influence of particle size on optical forces.

    Conclusions:

    • The integrated microfluidic/photonic architecture enables effective dynamic optofluidic particle manipulation.
    • Evanescent field forces provide both attraction and propulsion, controllable against pressure-driven flow.
    • The study provides insights into particle-size dependent optical forces for device optimization.