Inspired by the reflectarray concept, we propose a polarization beam splitter (PBS) using orthogonally oriented slotted graphene patches configured in a two-layer metasurface, which bidirectionally deflects the incident wave depending on its polarization in the terahertz (THz) regime. Our device employs slotted graphene patch resonators as plasmonic dipoles to provide a nearly 360° phase shift for orthogonal linearly polarized waves, which can be independently controlled for each polarization. The PBS operating frequency is also continuously tunable over a 20% frequency bandwidth, just by equally varying the graphene patches’ Fermi level in the device structure. In light of highly confined electromagnetic fields for slotted graphene patches, they have a very small effective mode volume, enabling us to utilize miniaturized metasurfaces and components. Moreover, due to the pattern simplicity of the slotted graphene patches, they can be used as practical building blocks for other THz metasurfaces with novel functionalities, which can be likely avenues for future telecommunication applications.

中文翻译：

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太赫兹状态下带缝隙石墨烯贴片阵列的动态可调偏振光束分裂

受反射阵列概念的启发，我们提出了一种偏振分束器（PBS），该偏振分束器（PBS）使用配置在两层超颖表面中的正交取向的开缝石墨烯贴片，根据入射波的极化在太赫兹（THz）体制中双向偏转。我们的设备采用缝隙式石墨烯贴片谐振器作为等离激元偶极子，为正交线性极化波提供了近360°的相移，可以针对每种极化独立地对其进行控制。只需在器件结构中相等地改变石墨烯贴片的费米能级，即可在20％的频率带宽上连续调节PBS工作频率。考虑到狭缝石墨烯贴片的电磁场受限，它们的有效模式体积很小，使我们能够利用小型化的超颖表面和组件。此外，由于开缝的石墨烯贴片的图案简单性，它们可以用作具有新颖功能的其他THz超表面的实用构建基块，这可能是将来电信应用的途径。