Directional Janus Metasurface.,Advanced Materials

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Directional Janus Metasurface.
Advanced Materials ( IF 27.4 ) Pub Date : 2019-11-20 , DOI: 10.1002/adma.201906352
Ke Chen ₁ , Guowen Ding ₁ , Guangwei Hu _{2,

3} , Zhongwei Jin ₂ , Junming Zhao ₁ , Yijun Feng ₁ , Tian Jiang ₁ , Andrea Alù _{3,

4} , Cheng-Wei Qiu ₂

Affiliation

Janus monolayers, a class of two-faced 2D materials, have received significant attention in electronics, due to their unusual conduction properties stemming from their inherent out-of-plane asymmetry. Their photonic counterparts recently allowed for the control of hydrogenation/dehydrogenation processes, yielding drastically different responses for opposite light excitation spins. A passive Janus metasurface composed of cascaded subwavelength anisotropic impedance sheets is demonstrated. By introducing a rotational twist in their geometry, asymmetric transmission with the desired phase function is realized. Their broken out-of-plane symmetry realizes different functions for opposite propagation directions, enabling direction-dependent versatile functionalities. A series of passive Janus metasurfaces that enable functionalities including one-way anomalous refraction, one-way focusing, asymmetric focusing, and direction-controlled holograms are experimentally demonstrated.

中文翻译：

定向Janus Metasurface。

Janus单层膜是一类两面的2D材料，由于其固有的平面外不对称性而具有异常的导电特性，因此在电子领域引起了极大的关注。他们的光子对应物最近允许控制氢化/脱氢过程，对相反的光激发自旋产生截然不同的响应。演示了由级联的亚波长各向异性阻抗片组成的无源Janus超表面。通过在其几何形状中引入旋转扭曲，可以实现具有所需相位功能的不对称传动。它们打破了平面外的对称性，可在相反的传播方向上实现不同的功能，从而实现了与方向相关的通用功能。

更新日期：2020-01-15

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