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Phase-matched metadevice for optical vortex interferometry: stable nano-displacement sensing.

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    A new metadevice enables highly stable nano-displacement sensing for optical metrology. This compact system overcomes limitations of traditional methods, offering enhanced accuracy and stability for precise measurements.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Nanotechnology

    Background:

    • High-precision optical metrology faces challenges with bulky, expensive equipment and environmental instability.
    • Traditional methods often rely on spatial light modulators and specific propagation distances.

    Purpose of the Study:

    • To develop a stable nano-displacement sensing system using a compact metadevice.
    • To overcome limitations of existing optical vortex-based metrology techniques.

    Main Methods:

    • Fabrication of a flexible, compact metadevice with 2D subwavelength nanostructure arrays.
    • Generation of a 4th-order vortex beam independent of propagation distance.
    • Application of topological charge and Gaussian weighting to suppress interference pattern errors.

    Main Results:

    • Achieved high sensitivity exceeding 0.05813°/nm.
    • Demonstrated excellent linearity with a coefficient of 0.99995 over a 400 nm range.
    • Attained a minimum uncertainty of 0.01% with a 200 nm step size.

    Conclusions:

    • The proposed metadevice offers a superior, integrated solution for optical metrology.
    • This approach enhances light field regulation and characterization for high-precision measurements.
    • The system demonstrates improved accuracy and stability compared to conventional methods.