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Related Experiment Video

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Optofluidic laser scanner based on a rotating liquid prism.

Daniel Kopp, Lukas Lehmann, Hans Zappe

    Applied Optics
    |May 4, 2016
    PubMed
    Summary

    We developed a novel electrowetting-actuated optofluidic system that functions as a tunable rotating liquid prism. This system precisely controls laser scanning with low power consumption, enabling advanced optical applications.

    Area of Science:

    • Optofluidics
    • Microfluidics
    • MEMS (Micro-Electro-Mechanical Systems)

    Background:

    • Traditional optical systems often involve bulky mechanical components.
    • Developing compact and reconfigurable optical systems is crucial for miniaturization.
    • Electrowetting offers a promising method for microfluidic manipulation.

    Purpose of the Study:

    • To demonstrate a novel electrowetting-actuated optofluidic system.
    • To implement a rotatable liquid prism for two-dimensional laser scanning.
    • To achieve precise control over liquid interfaces for optical applications.

    Main Methods:

    • Fabrication of a flexible polymeric foil with a high-density electrode array.
    • Integration of the foil into a cylindrical housing with two immiscible fluids.

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  • Utilizing electrowetting for actuation of the liquid/liquid interface.
  • Finite element simulations and experimental verification.

    • Main Results:

    • The system functions as a tunable rotating liquid prism.
    • Achieved a deflection angle of ±6.4° with a standard deviation of ±0.18°.
    • Demonstrated 360° rotation about the vertical axis.
    • Observed low power consumption (microwatts) and switching times of hundreds of milliseconds.

    Conclusions:

    • The electrowetting-actuated optofluidic system provides a highly planar and precisely positionable liquid/liquid interface.
    • This tunable rotating prism is suitable for two-dimensional laser scanning applications.
    • The novel fabrication technology enables compact and efficient optofluidic devices.