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Updated: May 9, 2026

Microfluidic Chips Controlled with Elastomeric Microvalve Arrays
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Variable aperture controlled by microelectrofluidic iris.

Jong-hyeon Chang1, Kyu-Dong Jung, Eunsung Lee

  • 1Medical System Laboratory, Samsung Advanced Institute of Technology, Yongin, Gyeonggi, South Korea. jh11.chang@samsung.com

Optics Letters
|August 2, 2013
PubMed
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This study introduces an adaptive liquid iris using microelectrofluidic technology. This novel device offers adjustable aperture sizes and fast response times for optical systems.

Area of Science:

  • Optics and Photonics
  • Microfluidics
  • Materials Science

Background:

  • Adaptive irises are crucial for controlling light in optical systems.
  • Existing iris technologies face limitations in speed, size, and tunability.
  • Microelectrofluidic technology offers a novel approach for dynamic optical component design.

Purpose of the Study:

  • To present a novel adaptive liquid iris (MEFI) based on microelectrofluidic technology.
  • To demonstrate the adjustable aperture and fast response of the MEFI.
  • To explore the potential applications of MEFI in optical imaging and diagnostics.

Main Methods:

  • Fabrication of the microelectrofluidic iris (MEFI) using transparent electrodes on glass plates and channel spacers.
  • Utilizing electrowetting to manipulate a light-absorbing liquid interface within a hydrophobic chamber.

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  • Employing segmented concentric control electrodes for digital operation and aperture adjustment.

    • Main Results:

    • The MEFI demonstrated a tunable aperture range from 4.2 to 0.85 mm, achieving an 80% tuning ratio.
    • Digital operation with clear aperture stops was successfully achieved.
    • A fast turnaround speed of 80 mm/s was measured, surpassing comparable adaptive liquid irises.

    Conclusions:

    • The developed MEFI offers a scalable aperture range and fast response, making it suitable for advanced optical applications.
    • The microelectrofluidic technology provides a promising platform for creating adaptive optical components.
    • MEFI is expected to find wide application in high-quality imaging systems and real-time diagnostic optical coherence tomography (OCT).