Broadband High-Efficiency Ultrathin Metasurfaces With Simultaneous Independent Control of Transmission and Reflection Amplitudes and Phases

We demonstrate a broadband near-100%-efficiency ultrathin metasurface operating at microwave and millimeter-wave frequencies. We develop and employ two orthogonally polarized metallic gratings to form a Fabry-Perot cavity and incorporate a subwavelength metallic double-split-ring resonator at the ce...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2022-01, Vol.70 (1), p.254-263
Main Authors: Wang, Yufang, Ge, Yuehe, Chen, Zhizhang, Liu, Xin, Pu, Jixiong, Liu, Kaiting, Chen, Huanyang, Hao, Yang
Format: Article
Language:English
Subjects:
Amplitudes
Angular momentum
Bandwidth
Broadband
Broadband communication
Cavity resonators
Electron beams
Fabry-Perot interferometers
Fabry–Perot cavity
Germanium
Gratings
metasurface
Metasurfaces
Microwave imaging
Millimeter waves
orbital angular momentum
Orbits
Phase control
Reflected waves
Reflection
Unit cell
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Summary:We demonstrate a broadband near-100%-efficiency ultrathin metasurface operating at microwave and millimeter-wave frequencies. We develop and employ two orthogonally polarized metallic gratings to form a Fabry-Perot cavity and incorporate a subwavelength metallic double-split-ring resonator at the center of each unit cell. It allows arbitrary amplitude-phase combinations with no coupling between amplitude and phase or between transmitted and reflected waves, leading to the design of an ultrathin but highly efficient broadband metasurface with multiple functionalities. Furthermore, the proposed metasurface can generate diffractive beams with different orders and vortex beams with different orbital angular momentum (OAM) modes in reflection and transmission spaces simultaneously. Both numerical and experimental results verify that the proposed metasurface has superior performance to its counterparts that are based solely on phase control. The proposed metasurface presents a lightweight, low-cost, and easily deployable flat device for microwave and millimeter-wave applications.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2021.3119376