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论文题目：Chirality-Intrigged Spin-Selective Metasurface and Applications in Generating Orbital Angular Momentum

摘要(英文)：Spin-selective metamirrors consisting of planar meta-atoms are able to reflect tailored incident circularly polarized waves either in similar or opposite handedness while absorbing the other handedness of spin-wave. In this paper, 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 is proposed to achieve spin-selective reflection/absorption. Meanwhile, a geometric phase is introduced to provide a full 2π 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 meta-device that can convert incident RHCP waves into vortex waves with identical handedness from 8.3 GHz 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 bi-functional performances of the proposed metamirror. Our strategy provides a promising route for the realization of spin-selective planar devices in wireless communications.

摘要（中文）：本论文提出一种极化选择性反射超表面，能够同时实现对入射圆极化波的极化选择性吸波和相位调制。反射超表面有非对称分裂环谐振器组成以实现极化选择性吸波/反射。同时，引入几何相位来实现2π反射相位。理论结果表明，超表面能够实现对于左旋圆极化波最高99.34%的吸收而右旋圆极化高于91%的反射率，并保持右旋圆极化的旋向不变。在此超表面单元基础上，设计一个能够吸收左旋圆极化波而反射右旋圆极化波为与入射波旋向相同的涡旋电磁波的极化选择性涡旋波生成器。为了实验验证，反射超表面被制备并在微波暗室被测试，其结果验证了所提出反射超表面的极化独立的双功能性能。提出的策略提供了一种在无线通信领域内实现极化选择性平面器件的有效方式。