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Wrinkled axicons: shaping light from cusps.

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    Researchers developed novel wrinkled axicons, a new type of optical element. These elements create unique beam shaping effects, including topological beam shaping via optical spin-orbit interaction.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Axicons are optical elements that generate non-diffracting Bessel beams.
    • Conventional axicons have limitations in complex beam shaping applications.

    Purpose of the Study:

    • To introduce a novel class of refractive optical elements: wrinkled axicons.
    • To explore the beam shaping capabilities of these novel elements, including intensity, phase, and topological properties.

    Main Methods:

    • Fabrication of micron-scale wrinkled axicons using three-dimensional femtosecond-laser photopolymerization.
    • Experimental and numerical characterization of the fabricated wrinkled axicons.

    Main Results:

    • Demonstration of unique geometrical singularities (cusps) on the axicon surface.
    • Characterization of beam shaping capabilities, including intensity and phase modulation.
    • Observation of topological beam shaping driven by modulated optical spin-orbit interaction.

    Conclusions:

    • Wrinkled axicons represent a new platform for advanced optical beam manipulation.
    • The developed technique enables precise fabrication of micro-optical elements with complex surface topographies.
    • These elements offer potential for novel applications in optical trapping, microscopy, and information processing.