Broadband twisted light beams generation using flat optics

Malaika Waheed, Nasir Mahmood, Yehia Massoud

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish (US)
Title of host publicationHolography, Diffractive Optics, and Applications XIII
EditorsChanghe Zhou, Ting-Chung Poon, Liangcai Cao, Hiroshi Yoshikawa
ISBN (Electronic)9781510667853
StatePublished - 2023
EventHolography, Diffractive Optics, and Applications XIII 2023 - Beijing, China
Duration: Oct 14 2023Oct 16 2023

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceHolography, Diffractive Optics, and Applications XIII 2023


  • Bessel beam
  • broadband meta-device
  • Flat optics
  • twisted light beams

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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