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Nature-inspired orbital angular momentum beam generator using aperiodic metasurface

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posted on 2021-05-04, 15:13 authored by Mustafa K Taher Al-Nuaimi, Wei Hong, William WhittowWilliam Whittow
This article presents the design of reflective nature-inspired metasurfaces for generation of wideband and high purity circularly polarized (CP) orbital angular momentum (OAM) waves. It has been shown in this article that the breaking of the transitional periodicity and the combination of aperiodic nature-inspired distribution of sub-wavelength sized meta-atoms based on Pancharatnam–Berry (PB) phase theory can lead to OAM beams of high purity with improved bandwidth. The distribution of the PB anisotropic meta-atoms across the proposed metasurface aperture is non-uniform and distributed along logarithmic spirals similar to sunflower seeds, i.e. outwardly logarithmic spiral lattices of no transitional periodicity. The proposed reflective CP-OAM beam generator metasurface diameter is 140 mm, thickness ≈ 0.11λ17GHz and has 600 anisotropic spatially rotated PB meta-atoms of sub-wavelength size of 5 mm ≈ 0.28λ17GHz. Four OAM metasurface generators have been designed to produce OAM waves of various modes from 1 to 4. Both simulation and experimental results have demonstrated that the proposed metasurfaces can efficiently generate CP-OAM beams from 13.1 GHz to 20.5 GHz (BW = 44%) with high mode purity >90%.

Funding

Anisotropic Microwave/Terahertz Metamaterials for Satellite Applications (ANISAT)

Engineering and Physical Sciences Research Council

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History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of Physics D: Applied Physics

Volume

54

Issue

27

Publisher

IOP Publishing

Version

  • AM (Accepted Manuscript)

Rights holder

© IOP Publishing

Publisher statement

This is the Accepted Manuscript version of an article accepted for publication in Journal of Physics D: Applied Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6463/abe81f.

Acceptance date

2021-02-19

Publication date

2021-04-29

Copyright date

2021

ISSN

0022-3727

eISSN

1361-6463

Language

  • en

Depositor

Prof Will Whittow. Deposit date: 4 May 2021

Article number

275106

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