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Single-sided continuous optoelectrowetting (SCOEW) for droplet manipulation with light patterns.

Sung-Yong Park1, Michael A Teitell, Eric P Y Chiou

  • 1Department of Mechanical and Aerospace Engineering, University of California at Los Angeles (UCLA), 43-147 Eng. IV, 420 Westwood Plaza, Los Angeles, CA 90095-1597, USA.

Lab on a Chip
|May 8, 2010
PubMed
Summary

Single-sided continuous optoelectrowetting (SCOEW) enables precise droplet manipulation on open surfaces. This novel approach overcomes electrode size limitations for microfluidic applications.

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Area of Science:

  • Microfluidics
  • Surface Science
  • Optoelectronics

Background:

  • Electrowetting-on-dielectric (EWOD) is a key lab-on-a-chip technology for droplet manipulation.
  • Conventional EWOD devices use parallel plates and digital electrodes, limiting minimum droplet size.
  • The physical size of electrodes restricts droplet manipulation capabilities.

Purpose of the Study:

  • To introduce a novel single-sided continuous optoelectrowetting (SCOEW) mechanism.
  • To demonstrate droplet manipulation on an open, featureless photoconductive surface using light patterns.
  • To overcome the limitations of traditional EWOD electrode size constraints.

Main Methods:

  • Development of the SCOEW mechanism utilizing light-patterned electrowetting modulation.

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  • Utilizing dynamic and reconfigurable optical patterns for droplet actuation.
  • Employing a single-sided, open configuration for flexible integration.

    • Main Results:

    • Continuous manipulation (transport, splitting, merging, mixing) of droplets from 50 microL to 250 pL (5-orders of magnitude).
    • Light-triggered, parallel, and volume-tunable droplet injection with <1% volume variation.
    • Actuation achieved with extremely low light intensity, even using standard LCD screens.

    Conclusions:

    • SCOEW offers a flexible and scalable platform for microfluidic droplet control.
    • The technology overcomes fundamental size limitations of pixilated electrodes in EWOD.
    • SCOEW provides a versatile interface for integrating with other microfluidic components and devices.