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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Optimal triplicator design applied to a geometric phase vortex grating.

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    Researchers created a novel liquid-crystal diffraction grating that generates three equal-intensity light beams. This technology enables the parallel production of vortex beams with tailored polarization and topological charge.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Liquid Crystal Technology

    Background:

    • Diffraction gratings are crucial optical components for manipulating light.
    • Achieving equal intensity across multiple diffraction orders and controlling polarization states remain challenges.

    Purpose of the Study:

    • To design and fabricate a geometric phase liquid-crystal diffraction grating for equal intensity beam splitting.
    • To develop geometric phase vortex diffraction gratings by embedding spiral phases.
    • To demonstrate a 2D version using micro-patterned retarders for parallel vortex beam generation.

    Main Methods:

    • Optimal triplicator design for a phase-only profile.
    • Analysis of polarization properties of the diffraction grating.
    • Embedding spiral phases to create vortex diffraction gratings.
    • Fabrication using micro-patterned half-wave retarders and photoalignment of liquid crystals.

    Main Results:

    • Realization of a geometric phase liquid-crystal diffraction grating with three equal intensity diffraction orders.
    • Successful design of geometric phase vortex diffraction gratings.
    • Demonstration of a 2D element capable of parallel generation of vortex beams with varying topological charge and polarization states.

    Conclusions:

    • The developed liquid-crystal diffraction grating offers efficient and controlled manipulation of light beams.
    • This technology provides a versatile platform for generating multiple vortex beams simultaneously.
    • The fabrication method is compatible with commercial facilities, paving the way for practical applications.