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Issue 43, 2019
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Twisted non-diffracting beams through all dielectric meta-axicons

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We demonstrate transmission-based all-dielectric, highly efficient (≈73.4%) and polarization-insensitive meta-axicons (for the visible wavelength of 633 nm) to generate zero and higher order Bessel beams without using additional components. The Bessel beams, owing to their diverse applications and non-diffractive properties, attract great interest from the scientific community. It is shown that the propagation length can be increased through a lower numerical aperture (∼2600 λ for NA = 0.1) whereas a higher full width at half maximum (< 0.5 λ) can be obtained for a higher numerical aperture (for NA ≥ 0.7). Our dielectric material, hydrogenated amorphous silicon (a-Si:H), provides a significant efficiency advantage over plasmonic and other high-index all-dielectric (e.g., TiO2 and GaN) metasurfaces in terms of cost, ease of fabrication, and CMOS compatibility. The finite difference time domain (FDTD) technique based numerically simulated and experimental results show excellent agreement. Due to the technological and scientific importance of the Bessel beams, the recommended material and meta-axicons provide an efficient and compact platform for realizing various advanced applications like optical manipulation, optical alignment, laser fabrication, imaging, and laser machining.

Graphical abstract: Twisted non-diffracting beams through all dielectric meta-axicons

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The article was received on 09 Jun 2019, accepted on 29 Sep 2019 and first published on 30 Sep 2019

Article type: Paper
DOI: 10.1039/C9NR04888J
Nanoscale, 2019,11, 20571-20578

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    Twisted non-diffracting beams through all dielectric meta-axicons

    N. Mahmood, H. Jeong, I. Kim, M. Q. Mehmood, M. Zubair, A. Akbar, M. Saleem, M. S. Anwar, F. A. Tahir and J. Rho, Nanoscale, 2019, 11, 20571
    DOI: 10.1039/C9NR04888J

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