论文标题
拓扑谷等离子体传输在双层石墨烯元面中用于传感应用
Topological valley plasmon transport in bilayer graphene metasurfaces for sensing applications
论文作者
论文摘要
位于拓扑带镜内部的拓扑保护的等离子模式正在吸引越来越多的注意力，这主要是由于它们对疾病引起的反向散射的稳健性。在这里，我们介绍了一个双层石墨烯元面，该元素具有等离激元拓扑谷界面模式，当跨表面的镜像对称性通过水平移动两个自由式石墨烯层的顶层的孔的晶格而折断。在这种配置中，沿双层石墨烯元面的域壁界面的光传播显示了单向特征。此外，我们使用了石墨烯的费米能量随着化学掺杂而变化的事实，它基于该跨表面的拓扑特性设计了一个分子传感器。这种效应引起了拓扑指导模式传播的强烈变化，该模式可以用作气体传感设备的基本工作原理。我们的工作打开了开发可靠的集成等离子设备进行分子传感的新方法。
Topologically protected plasmonic modes located inside topological bandgaps are attracting increasing attention, chiefly due to their robustness against disorder-induced backscattering. Here, we introduce a bilayer graphene metasurface that possesses plasmonic topological valley interface modes when the mirror symmetry of the metasurface is broken by horizontally shifting the lattice of holes of the top layer of the two freestanding graphene layers in opposite directions. In this configuration, light propagation along the domain-wall interface of the bilayer graphene metasurface shows unidirectional features. Moreover, we have designed a molecular sensor based on the topological properties of this metasurface using the fact that the Fermi energy of graphene varies upon chemical doping. This effect induces strong variation of the transmission of the topological guided modes, which can be employed as the underlying working principle of gas sensing devices. Our work opens up new ways of developing robust integrated plasmonic devices for molecular sensing.
