Li Wenjia, Yang Qingdong, You Oubo, Lu Cuicui, Guan Fuxin, Liu Jianlong, Shi Jinhui, Zhang Shuang
New Cornerstone Science Laboratory, Department of Physics, The University of Hong Kong, Hong Kong 999077, China.
Key Laboratory of Photonic Materials and Devices Physics for Oceanic Applications, Ministry of Industry and Information Technology of China, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150000, China.
Sci Adv. 2024 Aug 2;10(31):eadm7458. doi: 10.1126/sciadv.adm7458. Epub 2024 Jul 31.
Nonreciprocal transmission, resulting from the breaking of Lorentz reciprocity, plays a pivotal role in nonreciprocal communication systems by enabling asymmetric forward and backward propagations. Metasurfaces endowed with nonreciprocity represent a compact and facile platform for manipulating electromagnetic waves in an unprecedented manner. However, most passive metasurfaces that achieve nonreciprocal transmissions are polarization dependent. While incorporation of active elements or nonlinear materials can achieve polarization-independent nonreciprocal metasurfaces, the complicated configurations limit their practical applications. To address this issue, we propose and demonstrate a passive and linear metasurface that combines magneto-optical and chiral effects, enabling polarization-independent isolation. The designed metasurface achieves a transmittance of up to 80%, with a high contrast between forward and backward propagations. Our work introduces a novel mechanism for nonreciprocal transmission and lays the foundation for the development of compact, polarization-insensitive nonreciprocal devices.
由洛伦兹互易性的破坏导致的非互易传输，通过实现不对称的向前和向后传播，在非互易通信系统中起着关键作用。具有非互易性的超表面为以前所未有的方式操纵电磁波提供了一个紧凑且便捷的平台。然而，大多数实现非互易传输的无源超表面依赖于偏振。虽然引入有源元件或非线性材料可以实现与偏振无关的非互易超表面，但复杂的结构限制了它们的实际应用。为了解决这个问题，我们提出并展示了一种结合磁光和手征效应的无源线性超表面，实现了与偏振无关的隔离。所设计的超表面实现了高达80%的透射率，前后传播之间具有高对比度。我们的工作引入了一种非互易传输的新机制，为紧凑、对偏振不敏感的非互易器件的发展奠定了基础。
