一种由沙漏形石墨烯阵列组成的可调谐太赫兹超材料吸收器。

A Tunable Terahertz Metamaterial Absorber Composed of Hourglass-Shaped Graphene Arrays.

作者信息

Qi Yunping, Zhang Yu, Liu Chuqin, Zhang Ting, Zhang Baohe, Wang Liyuan, Deng Xiangyu, Wang Xiangxian, Yu Yang

机构信息

College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China.

Engineering Research Center of Gansu Provence for Intelligent Information Technology and Application, Northwest Normal University, Lanzhou 730070, China.

出版信息

Nanomaterials (Basel). 2020 Mar 17;10(3):533. doi: 10.3390/nano10030533.

In this paper, we demonstrate a tunable periodic hourglass-shaped graphene arrays absorber in the infrared (IR) and terahertz (THz) frequency bands. The effects of graphene geometric parameters, chemical potentials, periods, and incident angles on the pure absorption characteristics are studied by using the Finite Difference Time Domain (FDTD) method. In addition, this paper also analyzes the pure absorption characteristics of bilayer graphene arrays. The simulation results show that the maximum absorption reaches 38.2% for the monolayer graphene structure. Furthermore, comparing the bilayer graphene structure with the monolayer structure under the same conditions shows that the bilayer structure has a tunable dual-band selective absorption effect and has a higher maximum absorption of 41.7%. Moreover, it was found that there are dual-band tunable absorption peaks at 26 μm and 36.3 μm with the maximum absorption of 41.7% and 11%. The proposed structure is a convenient method which could be used in the design of graphene-based optoelectronic devices, biosensors, and environmental monitors.

在本文中，我们展示了一种在红外（IR）和太赫兹（THz）频段可调谐的周期性沙漏形石墨烯阵列吸收器。利用时域有限差分（FDTD）方法研究了石墨烯几何参数、化学势、周期和入射角对纯吸收特性的影响。此外，本文还分析了双层石墨烯阵列的纯吸收特性。模拟结果表明，单层石墨烯结构的最大吸收率达到38.2%。此外，在相同条件下将双层石墨烯结构与单层结构进行比较，结果表明双层结构具有可调谐的双波段选择性吸收效应，且最大吸收率更高，为41.7%。此外，还发现存在位于26μm和36.3μm处的双波段可调谐吸收峰，最大吸收率分别为41.7%和11%。所提出的结构是一种可用于基于石墨烯的光电器件、生物传感器和环境监测器设计的便捷方法。