Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 70, Issue 6, Pages 4549-4557Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2022.3140491
Keywords
Chiral metasurface; spin-selective absorption; vortex beam generation
Funding
- Xidian University
- Open Project of State Key Laboratory of Millimeter Waves [K202233]
- National Natural Science Foundation of China (NSFC) [61801366, 62122019]
- Natural Science Foundation of Shaanxi Province [2020JM-078]
- Fundamental Research Funds for the Central Universities [2242021k30041]
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This article proposes a novel design of a metamirror that achieves spin-selective absorption and phase modulation by using asymmetric split-ring resonators (ASRRs) and introducing a geometric phase. Theoretical results show that the maximum absorption rate for waves of the same handedness can reach 99.34%. Experimental verification demonstrates the spin-dependent bifunctional performances of the proposed metamirror.
Spin-selective metamirrors consisting of planar meta-atoms are able to reflect tailored incident circularly polarized (CP) waves either in similar or opposite handedness while absorbing the other handedness of spin-wave. In this article, we propose a novel design of a metamirror exhibiting both spin-selective absorption and phase modulation properties. A chiral metamirror with asymmetric split-ring resonators (ASRRs) is proposed to achieve spin-selective reflection/absorption. Meanwhile, a geometric phase is introduced to provide a full 2 pi reflection-phase coverage. Theoretical results indicate a maximum absorption of 99.34% for left-handed circularly polarized (LHCP) wave, while keeping the reflection of right-handed circularly polarized (RHCP) higher than 91% without changing the handedness. By virtue of the above merits, we implement a metadevice that can convert incident RHCP waves into vortex waves with identical handedness from 8.3 to 10.3 GHz and absorb incident LHCP waves at its operation band. For experimental verification, a proof-of-concept metamirror is fabricated and experimentally characterized, which reveals the spin-dependent bifunctional performances of the proposed metamirror. Our strategy provides a promising route for the realization of spin-selective planar devices in wireless communications.
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