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Terahertz vortex beam generator based on bound states in the continuum.

TaiRong Bai, Qian Li, YiQing Wang

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    Researchers created vortex beams using photonic crystal slabs, overcoming limitations of traditional methods for optical communications. This novel approach enables applications in quantum information and micro-manipulation.

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    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics

    Background:

    • Vortex beams are vital for optical communications.
    • Existing generators (spiral phase plates, metasurfaces) have spatial limitations.

    Purpose of the Study:

    • To propose a new method for generating vortex beams using bound states in the continuum (BIC).
    • To overcome the practical application limitations of traditional vortex beam generators.

    Main Methods:

    • Utilizing bound states in the continuum (BIC) within a photonic crystal slab structure.
    • Theoretical analysis of the photonic crystal slab as a "momentum-space resonator".

    Main Results:

    • Demonstrated the generation of vortex beams using the proposed BIC-based photonic crystal slab.
    • Showcased the ability to generate higher-order vortex beams by altering the photonic crystal slab's symmetry.

    Conclusions:

    • The BIC-supported photonic crystal slab offers a novel and practical approach to vortex beam generation.
    • This method enhances the applicability of vortex beams in quantum information processing and micro-manipulation.