Broadband twisted light beams generation using flat optics

Malaika Waheed; Nasir Mahmood; Yehia Massoud

doi:10.1117/12.2687642

27 November 2023 Broadband twisted light beams generation using flat optics

Malaika Waheed, Nasir Mahmood, Yehia Massoud

Proceedings Volume 12768, Holography, Diffractive Optics, and Applications XIII; 127682J (2023) https://doi.org/10.1117/12.2687642
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

In recent years, metasurfaces, a flat version of three-dimensional metamaterials, have become a versatile nanophotonics platform for unprecedented light manipulation. Amongst the numerous realizations of exotic optical phenomena through metasurfaces such as meta-lensing, meta-holography, and structured beams, Bessel beam generation caught significant attention due to its non-diffracting and self-healing nature. Bessel beams can be produced using various conventional methods, including spatial light modulators, composite holograms, and diffractive optical elements. These methods, however, are unfit to integrate with cutting-edge on-chip devices due to low throughput, polarization dependence, excessive bulkiness, and limited numerical aperture. In the method of generating Bessel beams through flat optics, the selection of suitable material is a crucial factor. Thus, due to constraints of inherent material properties, broadband operation with high efficiency remains challenging. Here, we demonstrated highly efficient broadband Bessel beams generating meta-devices in the visible domain using single-layer all-dielectric transmissive metasurfaces. The constituent nanoresonators of zinc sulfide (ZnS) are optimized for high-resolution phase modulation. ZnS offers the best-suited optical properties that ensure high transmission efficiency throughout the visible spectrum. To verify the proposed design technique, we realized single-element-driven meta-devices to generate Bessel beams with higher numerical apertures and different topological charges, illustrating their exceptional non-diffraction properties. For real-life applications like optical communication, the proposed design strategy could speed up consumer-level device implementation.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Malaika Waheed, Nasir Mahmood, and Yehia Massoud "Broadband twisted light beams generation using flat optics", Proc. SPIE 12768, Holography, Diffractive Optics, and Applications XIII, 127682J (27 November 2023); https://doi.org/10.1117/12.2687642

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