Novel silicon bipodal cylinders with controlled resonances and their use as beam steering metasurfaces

Abstract Metasurfaces have paved the way for high performance wavefront shaping and beam steering applications. Phase-gradient metasurfaces (PGM) are of high importance owing to the powerful and relatively systematic tool they offer for manipulating electromagnetic wave fronts and achieving various...

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Main Authors:	Samar M. Fawzy, Ahmed M. Mahmoud, Yehea I. Ismail, Nageh K. Allam
Format:	article
Language:	EN
Published:	Nature Portfolio 2021
Subjects:	Medicine R Science Q
Online Access:	https://doaj.org/article/b16d03c61a6c4cbb8e742d28e0500d3c
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spelling	oai:doaj.org-article:b16d03c61a6c4cbb8e742d28e0500d3c2021-12-02T16:32:08ZNovel silicon bipodal cylinders with controlled resonances and their use as beam steering metasurfaces10.1038/s41598-021-93041-x2045-2322https://doaj.org/article/b16d03c61a6c4cbb8e742d28e0500d3c2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93041-xhttps://doaj.org/toc/2045-2322Abstract Metasurfaces have paved the way for high performance wavefront shaping and beam steering applications. Phase-gradient metasurfaces (PGM) are of high importance owing to the powerful and relatively systematic tool they offer for manipulating electromagnetic wave fronts and achieving various functionalities. Herein, we numerically present a novel unit cell known as bipodal cylinders (BPC), made of Silicon (Si) and placed on a Silicon dioxide (SiO2) substrate to be compatible with CMOS fabrication techniques and to avoid field leakage into a high index substrate. Owing to its geometrical structure, the BPC structure provides a promising unit cell for electromagnetic wave manipulation. We show that BPC offers a way to shift the electric dipole mode to a frequency higher than that of the magnetic dipole mode. We investigate the effect of varying different geometrical parameters on the performance of such unit cell. Building on that, a metasurface is then presented that can achieve efficient electromagnetic beam steering with high transmission of 0.84 and steering angle of 15.2°; with very good agreement with the theoretically predicted angle covering the whole phase range from 0 to 2 $$\pi$$ π .Samar M. FawzyAhmed M. MahmoudYehea I. IsmailNageh K. AllamNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Samar M. Fawzy Ahmed M. Mahmoud Yehea I. Ismail Nageh K. Allam Novel silicon bipodal cylinders with controlled resonances and their use as beam steering metasurfaces
description	Abstract Metasurfaces have paved the way for high performance wavefront shaping and beam steering applications. Phase-gradient metasurfaces (PGM) are of high importance owing to the powerful and relatively systematic tool they offer for manipulating electromagnetic wave fronts and achieving various functionalities. Herein, we numerically present a novel unit cell known as bipodal cylinders (BPC), made of Silicon (Si) and placed on a Silicon dioxide (SiO2) substrate to be compatible with CMOS fabrication techniques and to avoid field leakage into a high index substrate. Owing to its geometrical structure, the BPC structure provides a promising unit cell for electromagnetic wave manipulation. We show that BPC offers a way to shift the electric dipole mode to a frequency higher than that of the magnetic dipole mode. We investigate the effect of varying different geometrical parameters on the performance of such unit cell. Building on that, a metasurface is then presented that can achieve efficient electromagnetic beam steering with high transmission of 0.84 and steering angle of 15.2°; with very good agreement with the theoretically predicted angle covering the whole phase range from 0 to 2 $$\pi$$ π .
format	article
author	Samar M. Fawzy Ahmed M. Mahmoud Yehea I. Ismail Nageh K. Allam
author_facet	Samar M. Fawzy Ahmed M. Mahmoud Yehea I. Ismail Nageh K. Allam
author_sort	Samar M. Fawzy
title	Novel silicon bipodal cylinders with controlled resonances and their use as beam steering metasurfaces
title_short	Novel silicon bipodal cylinders with controlled resonances and their use as beam steering metasurfaces
title_full	Novel silicon bipodal cylinders with controlled resonances and their use as beam steering metasurfaces
title_fullStr	Novel silicon bipodal cylinders with controlled resonances and their use as beam steering metasurfaces
title_full_unstemmed	Novel silicon bipodal cylinders with controlled resonances and their use as beam steering metasurfaces
title_sort	novel silicon bipodal cylinders with controlled resonances and their use as beam steering metasurfaces
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b16d03c61a6c4cbb8e742d28e0500d3c
work_keys_str_mv	AT samarmfawzy novelsiliconbipodalcylinderswithcontrolledresonancesandtheiruseasbeamsteeringmetasurfaces AT ahmedmmahmoud novelsiliconbipodalcylinderswithcontrolledresonancesandtheiruseasbeamsteeringmetasurfaces AT yeheaiismail novelsiliconbipodalcylinderswithcontrolledresonancesandtheiruseasbeamsteeringmetasurfaces AT nagehkallam novelsiliconbipodalcylinderswithcontrolledresonancesandtheiruseasbeamsteeringmetasurfaces
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Novel silicon bipodal cylinders with controlled resonances and their use as beam steering metasurfaces

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