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    Researchers developed a nanoscale beam splitter using lithium niobate metasurfaces. This compact device efficiently splits light into multiple directions, offering tunable ratios for advanced photonic applications.

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    Area of Science:

    • Photonics
    • Nanotechnology
    • Materials Science

    Background:

    • Beam splitters are critical in optical systems like interferometers.
    • Conventional beam splitters (cubes, plates) are often bulky.
    • Miniaturization of photonic devices requires nanoscale components.

    Purpose of the Study:

    • To demonstrate a beam splitter with nanoscale thickness.
    • To reduce the overall size of optical and photonic devices.
    • To explore tunable beam splitting using gradient metasurfaces.

    Main Methods:

    • Fabrication of a gradient metasurface using lithium niobate cylinder arrays.
    • Utilizing unit cells with two cylinder rows to create opposite phase gradients.
    • Applying the generalized Snell's law to control light splitting direction.

    Main Results:

    • Successful demonstration of a nanoscale beam splitter.
    • Light is split into different directions based on metasurface design.
    • The beam splitting ratio is effectively tunable.

    Conclusions:

    • Nanoscale beam splitters can be realized using gradient metasurfaces.
    • Lithium niobate metasurfaces offer a pathway to miniaturized optical devices.
    • Tunable beam splitting is achievable, enabling versatile photonic applications.