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Nonmechanical spectral domain optical coherence tomography using an electrowetting beam-scanner.

Samuel D Gilinsky, Eduardo J Miscles, Jan Bartos

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    |September 23, 2025
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel electrowetting beam-steering prism for lateral scanning in spectral domain optical coherence tomography (SD-OCT). This compact, nonmechanical prism enables OCT imaging without compromising system performance.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Microfluidics

    Background:

    • Optical Coherence Tomography (OCT) is a powerful non-invasive imaging technique.
    • Traditional OCT systems often rely on bulky mechanical scanning mechanisms.
    • Electrowetting optics offer a compact, low-power, and nonmechanical alternative for optical beam steering.

    Purpose of the Study:

    • To demonstrate the first application of an electrowetting beam-steering prism for lateral scanning in a benchtop spectral domain OCT system.
    • To evaluate the performance of an electrowetting prism in an OCT setup.
    • To assess the suitability of electrowetting optics for miniaturized OCT applications, such as endoscopic OCT.

    Main Methods:

    • Integration of an electrowetting beam-steering prism into a spectral domain OCT system.
    • Utilizing a 1091 nm, 53 nm bandwidth gain-managed nonlinear fiber amplifier as the light source.
    • Characterization of the OCT system's field of view, axial resolution, and sensitivity with the electrowetting prism.
    • The electrowetting prism achieved lateral scanning of ±6° with an applied voltage of 67 V ±20 V.

    Main Results:

    • Successful implementation of lateral scanning using an electrowetting prism in a benchtop SD-OCT system.
    • The electrowetting prism enabled OCT image acquisition without degradation of key system performance metrics.
    • Demonstrated the feasibility of using electrowetting optics for beam steering in OCT.

    Conclusions:

    • Electrowetting beam-steering prisms are a viable and effective technology for lateral scanning in SD-OCT.
    • This nonmechanical approach is well-suited for developing compact and robust OCT systems.
    • The developed system shows promise for future endoscopic and miniaturized OCT applications.