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

Author's Department

Electronics & Communications Engineering Department

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https://doi.org/10.1038/s41598-021-93041-x

All Authors

Samar M. Fawzy; Ahmed M. Mahmoud; Yehea I. Ismail; Nageh K. Allam

Document Type

Research Article

Publication Title

Scientific reports

Publication Date

7-3-2021

doi

10.1038/s41598-021-93041-x

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 (SiO) 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[Formula: see text].

First Page

13635

Last Page

13635

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