Dual-band giant spin-selective full-dimensional manipulation of graphene-based chiral meta-mirrors for terahertz waves
Dual-band giant spin-selective full-dimensional manipulation of graphene-based chiral meta-mirrors for terahertz waves
复制标题
太赫兹波石墨烯基手性元镜的双波段巨自旋选择性全维操控
DOI：
10.1364/oe.463220
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发表时间：
2022
期刊：
影响因子：
3.8
通讯作者：
Jian-Quan Yao
中科院分区：
文献类型：
--
作者：
Hui Li;Jie Li;Chenglong Zheng;Hang xu;Fan Yang;Jitao Li;Yue Zhen;Wei Shi;Yating Zhang;Jian-Quan Yao
同时实现圆二色性（CD）和波前操纵的能力对于许多实际应用，特别是对于检测和成像是极其重要的。然而，许多先前观察到的弱手性特征仅限于具有复杂三维构建构型、单一窄带响应、无主动可调谐性的纳米结构，离集成化和小型化的目标越来越远。基于杂化耦合原理，提出了一种具有自旋选择性全维操作的双层全石墨烯超反射镜平台，可同时实现巨大的双波段CD响应和波前整形。通过简单地控制超反射镜的结构变量和石墨烯的特性参数，即被动和主动调节相结合，所提出的设计可以选择性地操纵入射圆偏振波的偏振，幅度，相位和工作频率。作为概念验证，我们使用超反射镜设计了两个具有自旋选择特性的超表面阵列，用于动态太赫兹（THz）波前整形和近场数字成像，这两者都表现出高性能的动态可调谐性。这种方法可以为下一代智能THz通信系统提供额外的选择。
The ability to simultaneous achieve circular dichroism (CD) and wavefront manipulation is extremely important for many practical applications, especially for detecting and imaging. However, many of the previously observed weakness chiral features are limited to nanostructures with complex three-dimensional building configurations, single narrow-band response, and no active tunability, which are getting farther and away from the goal of integration and miniaturization. Here, a platform of bi-layer all-graphene meta-mirrors with spin-selective full-dimensional manipulation is proposed to simultaneously achieve giant dual-band CD response and wavefront shaping, based on the principle of the hybridization coupling. By simply controlling the structural variables of the meta-mirror and the characteristic parameters of graphene, that is, the combination of passive and active regulation, the proposed design can selectively manipulate the polarization, amplitude, phase, and working frequency of the incident circularly polarized wave near-independently. As a proof of concept, we used the meta-mirror to design two metasurface arrays with spin-selective properties for dynamic terahertz (THz) wavefront shaping and near-field digital imaging, both of which show a high-performance dynamic tunability. This method could provide additional options for the next-generation intelligent THz communication systems.