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Large extinction ratio optical electrowetting shutter.

Ryan D Montoya, Kenneth Underwood, Soraya Terrab

    Optics Express
    |May 4, 2016
    PubMed
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    An electrowetting optical shutter uses liquid interfaces to control light. This device achieves high extinction ratios, showing potential for advanced chip-scale atomic clocks.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Microfluidics

    Background:

    • Optical shutters are crucial components in various photonic systems.
    • Existing technologies often face limitations in size, speed, or extinction ratio.
    • Electrowetting offers a novel approach for microscale optical control.

    Purpose of the Study:

    • To demonstrate a novel optical shutter utilizing electrowetting principles.
    • To achieve a large extinction ratio for precise light control.
    • To explore the potential applications in chip-scale atomic clocks.

    Main Methods:

    • Fabrication of an optical shutter based on electrowetting.
    • Utilizing the tunable curvature of a liquid-liquid interface.
    • Employing total internal reflection (TIR) modulation via voltage control.

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  • Characterization of interface radius of curvature and extinction ratio.

    • Main Results:

    • Demonstrated a functional optical shutter with electrowetting liquids.
    • Achieved continuous tuning of the interface radius of curvature from 9 mm to -45 mm.
    • Measured high extinction ratios ranging from 55.8 dB to 66.5 dB.
    • Verified the switching mechanism based on total internal reflection.

    Conclusions:

    • Electrowetting liquid interfaces provide an effective method for creating high-performance optical shutters.
    • The demonstrated device offers a promising solution for light modulation with a large extinction ratio.
    • The technology holds significant potential for integration into ultracold chip-scale atomic clocks.