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Agile wide-angle beam steering with electrowetting microprisms.

Neil R Smith, Don C Abeysinghe, Joseph W Haus

    Optics Express
    |June 12, 2009
    PubMed
    Summary
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    Novel electrowetting microprisms (EMPs) enable continuous beam steering by modulating liquid contact angles. This technology offers fast, efficient, and polarization-independent beam deflection for applications like Ladar.

    Area of Science:

    • Optics and Photonics
    • Microfluidics
    • Materials Science

    Background:

    • Traditional beam steering methods often involve bulky or slow mechanical components.
    • Electrowetting offers a tunable method for manipulating liquid interfaces.
    • Mimicking classical prism behavior with microscale devices presents an engineering challenge.

    Purpose of the Study:

    • To introduce and demonstrate a novel basis for beam steering using electrowetting microprisms (EMPs).
    • To investigate the refractive behavior and steering capabilities of EMPs.
    • To evaluate the potential of EMPs for applications such as Ladar.

    Main Methods:

    • Utilized electrowetting to modulate the liquid contact angle within microprism structures.
    • Employed liquids with a refractive index of n=1.359 to achieve continuous beam steering.

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  • Compared experimental results with theoretical predictions up to electrowetting contact-angle saturation.

    • Main Results:

    • Demonstrated continuous beam steering over an angle of 14 degrees (+/-7 degrees).
    • Experimental data closely matched theoretical models.
    • Projected steering angles of approximately 30 degrees (+/-15 degrees) with higher index liquids (n~1.6).

    Conclusions:

    • Electrowetting microprisms provide a viable and efficient method for beam steering.
    • The technology exhibits fast switching speeds (~ms), polarization independence, and tunable field-of-view modulation.
    • EMPs show significant promise for Ladar and other optical systems requiring dynamic beam control.