论文标题
基于混合石墨烯元面的可调非线性和活动性THZ设备
Tunable nonlinear and active THz devices based on hybrid graphene metasurfaces
论文作者
论文摘要
石墨烯是在蜂窝晶格中排列的二维碳原子层，其出色的特性使其成为未来电子和光子Terahertz（THZ）设备的绝佳材料。在这项工作中，我们使用放置在金属光栅上的单层石墨烯来设计混合石墨烯元面积，在THZ频率范围内运行。在共振上可以实现完美的吸收，由于石墨烯和光栅等离子体响应之间的耦合，电场大大增强。沿石墨烯单层的电场增强以及石墨烯的较大非线性电导率可以显着增强所提出的THZ设备的非线性响应。另外，可以通过改变石墨烯的掺杂水平来显着调节所提出的增强的非线性效应。所提出的结构可用于THZ频率发生器和全光处理器的设计。
Graphene is a two-dimensional layer of carbon atoms arranged in a honeycomb lattice, whose outstanding properties makes it an excellent material for future electronic and photonic terahertz (THz) devices. In this work, we design hybrid graphene metasurfaces by using a monolayer graphene placed over a metallic grating, operating in the THz frequency range. Perfect absorption can be achieved at the resonance, where the electric field is greatly enhanced due to the coupling between the graphene and the grating plasmonic responses. The enhancement of the electric field along the graphene monolayer, as well as the large nonlinear conductivity of graphene, can dramatically boost the nonlinear response of the proposed THz device. In addition, the presented enhanced nonlinear effects can be significantly tuned by varying the doping level of graphene. The proposed structure can be used in the design of THz-frequency generators and all-optical processors.
