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Refractive hard x-ray vortex phase plates.

Frank Seiboth, Maik Kahnt, Mikhail Lyubomirskiy

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    |September 14, 2019
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    Summary
    This summary is machine-generated.

    Researchers created hard x-ray beams with orbital angular momentum using fused silica spiral phase plates. These vortex beams, generated via laser ablation, show submicrometer donut rings, advancing x-ray manipulation capabilities.

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    Area of Science:

    • Optics and Photonics
    • X-ray Science
    • Materials Science

    Background:

    • Orbital angular momentum (OAM) in light offers unique properties for beam manipulation.
    • Generating OAM in hard x-ray beams is challenging but crucial for advanced applications.
    • Spiral phase plates are a known method for imparting OAM to light.

    Purpose of the Study:

    • To demonstrate the creation of hard x-ray beams with specific topological charges (-ℏ and -3ℏ) carrying orbital angular momentum.
    • To investigate the use of fused silica spiral phase plates fabricated by ultrashort-pulsed laser ablation for generating these OAM x-ray beams.
    • To analyze the characteristics of the generated vortex beams and compare them with theoretical models.

    Main Methods:

    • Fabrication of fused silica spiral phase plates using ultrashort-pulsed laser ablation.
    • The phase plates were designed with a smooth phase ramp and specific step height (0.5 μm).
    • Generation of hard x-ray beams (8.2 keV) carrying OAM by passing them through the fabricated phase plates.

    Main Results:

    • Successfully generated hard x-ray beams with topological charges of -ℏ and -3ℏ.
    • The generated vortex beams exhibited submicrometer-sized donut ring structures.
    • Experimental results showed good agreement with numerical modeling predictions.

    Conclusions:

    • Fused silica spiral phase plates fabricated by laser ablation are effective for generating hard x-ray beams with orbital angular momentum.
    • The generated submicrometer vortex beams demonstrate precise control over the x-ray's electromagnetic field.
    • These phase plates show potential for manipulating intense x-ray beams at advanced facilities like x-ray free-electron lasers.