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    Area of Science:

    • Optics and Photonics
    • Nanotechnology
    • Materials Science

    Background:

    • Geometric phase optical elements utilize structured anisotropy for phase control.
    • Amplitude shaping with space-variant retardance is challenging due to spin-orbit coupling effects on optical phase.

    Purpose of the Study:

    • To propose a novel bilayered subwavelength grating design for amplitude shaping.
    • To cancel the spatial modulation of the dynamic phase in optical elements.
    • To enable precise beam shaping, specifically for single-mode Laguerre-Gauss beams.

    Main Methods:

    • Inspired by Babinet's principle, a bilayered subwavelength grating was designed.
    • The design aims to counteract the dynamic phase modulation inherent in space-variant retardance.
    • Simulations and theoretical analysis were used to validate the concept.

    Main Results:

    • The proposed bilayered grating effectively cancels the dynamic phase modulation.
    • This allows for independent control over both phase and amplitude of light.
    • Demonstrated feasibility for shaping single-mode Laguerre-Gauss beams.

    Conclusions:

    • The bilayered subwavelength grating offers a new pathway for optical amplitude shaping.
    • This design overcomes limitations imposed by spin-orbit interactions in optical elements.
    • Enables advanced applications in optical beam manipulation and laser technologies.