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Faraday Disk Dynamo01:23

Faraday Disk Dynamo

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All-fiber focused optical vortex array generator based on a Dammann-Kinoform spiral zone plate.

Yuji Wang, Luping Wu, Rui Liu

    Optics Letters
    |February 28, 2025
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    Researchers developed an all-fiber focused optical vortex array (FOVA) generator using nanoprinting. This device enables precise multi-target particle manipulation and optical applications.

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    Area of Science:

    • Optics and Photonics
    • Nanotechnology
    • Materials Science

    Background:

    • Optical vortex arrays (OVA) offer advanced modulation capabilities but traditional generation methods are complex and bulky.
    • Existing techniques require numerous optical components and objective lenses for OVA generation and focusing.

    Purpose of the Study:

    • To develop a highly integrated, all-fiber generator for focused optical vortex arrays (FOVA).
    • To demonstrate the capability of the generated FOVA for multi-target particle manipulation.

    Main Methods:

    • Fabrication of a Dammann-Kinoform spiral zone plate (DKSZP) on a fiber facet using femtosecond laser two-photon polymerization (TPP) nanoprinting.
    • Design and verification of FOVA parameters (focal length, vortex spacing, topological charge) via simulation and experimentation.
    • Utilizing the generated FOVA for capturing and rotating silica microsphere trimers.

    Main Results:

    • Successful generation of 1D or 2D FOVA from an incident Gaussian beam using the DKSZP.
    • Demonstrated precise control over FOVA characteristics, including focal length, vortex spacing, and topological charge.
    • Achieved stable capture and rotation of silica microsphere trimers using the multiple trapping sites of the FOVA, showcasing multi-target manipulation capabilities.

    Conclusions:

    • The developed all-fiber FOVA generator offers a compact and integrated solution for generating complex optical fields.
    • The FOVA's ability to create multiple robust trapping sites with orbital angular momentum (OAM) is effective for multi-target particle manipulation.
    • This work presents a novel approach for integrated FOVA generation devices with significant potential in particle manipulation, optical communication, metrology, and microfluidics.