基于石墨烯的光学控制窄带太赫兹开关（英文）

Optically controlled narrowband terahertz switcher based on graphene

本文提出了一种光控太赫兹开关,该开关采用覆盖单层石墨烯的十字金属谐振器超表面。利用石墨烯表面电导率模型和有限元法计算了这种复合结构的光谱特性。模拟结果表明,在0.2 W/mm^2的光泵浦后,传输谱(调制深度为36.8%,Q-因子为250)出现了窄带共振衰减现象。另外,这种衰减的调制深度可以通过改变泵浦强度微调节。因此,光学可调谐太赫兹开关的设计将有助于太赫兹通信应用的功能组件开发。

This paper proposes an optically controlled terahertz switcher based on cross-shaped metal resonators metasurface covered by monolayer graphene.The spectral characteristics of proposed composite structure were calculated using the surface conductivity model of graphene and the finite element method.The modeling demonstrated the appearance of a narrowband resonant dip in the transmission spectrum with a modulation depth of 36.8%and a Q-factor of 250 after the optical pump intensity achieving to 0.2 W/mm 2.In addition,the modulation depth of such a dip can be slightly tuned by varying value of the pump intensity.Thus,the design of the optically tunable terahertz switcher may contribute to the development of functional components for terahertz communication applications.