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    Researchers developed a novel diffraction-limit focusing technique using spiral slit patterns on metallic films. This method achieves high-resolution focusing and subwavelength capabilities, offering a low-cost alternative to metasurfaces.

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    Area of Science:

    • Optics and Photonics
    • Nanotechnology
    • Materials Science

    Background:

    • Diffraction-limit focusing is crucial for high-resolution imaging and optical manipulation.
    • Existing methods like metasurfaces can be costly and complex to fabricate.
    • Orbital angular momentum (OAM) beams offer unique properties but require specialized manipulation for focusing.

    Purpose of the Study:

    • To demonstrate a new, accessible technique for achieving diffraction-limit focusing.
    • To convert orbital angular momentum beams into high-resolution, non-helical beams.
    • To achieve subwavelength focusing with broadband characteristics.

    Main Methods:

    • Fabrication of a 60-nm-thick metallic film with spirally structured slit motifs.
    • Utilizing the spatial truncation of incident light by the spiral pattern.
    • Exploiting the global phase domain created by the spiral pattern for wave vector distribution.
    • Employing topological complementarity between incident OAM beams and slit motifs.

    Main Results:

    • Achieved diffraction-limit focusing with a high numerical aperture (NA) of 0.89 in air and up to 1.07 in oil immersion.
    • Demonstrated broadband subwavelength focusing capabilities.
    • Successfully converted OAM beams to non-helical, high-resolution diffractive focusing beams.
    • The technique is shown to be more accessible and lower-cost than metasurface-based focusing elements.

    Conclusions:

    • The spiral slit motif technique offers an effective and accessible method for high-resolution and subwavelength focusing.
    • This approach provides a cost-effective alternative to existing focusing technologies.
    • The concept is scalable for larger applications and can be extended to various optical scenarios.