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Large-angle and high-efficiency tunable phase grating using fringe field switching liquid crystal.

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    We developed a switchable phase grating using fringe field switching (FFS) cells, offering high diffraction efficiency and a large diffraction angle. This technology enables fast response times, even in cold temperatures, for advanced optical applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Phase gratings are crucial optical components.
    • Fringe field switching (FFS) technology offers unique electro-optic properties.

    Purpose of the Study:

    • To propose and characterize a novel switchable phase grating utilizing FFS cells.
    • To investigate the performance metrics of the FFS phase grating, including diffraction efficiency, angle, and response time.

    Main Methods:

    • Fabrication of FFS cells for phase grating application.
    • Experimental characterization of diffraction properties and response times.
    • Development of a simulation model to correlate with experimental findings.

    Main Results:

    • The FFS phase grating achieved >32% light diffraction to ± 2nd orders with a 12.1° diffraction angle.
    • Fast response times were maintained even at -40°C.
    • A simulation model showed good agreement with experimental results.

    Conclusions:

    • FFS cells provide a viable platform for switchable phase gratings with excellent performance.
    • The demonstrated blazed phase grating enables tunable beam steering capabilities.