Multiple plasmonic resonance excitations on graphene metamaterials for ultrasensitive terahertz sensing
Multiple plasmonic resonance excitations on graphene metamaterials for ultrasensitive terahertz sensing
复制标题
石墨烯超材料的多重等离子体共振激发用于超灵敏太赫兹传感
DOI：
10.1016/j.carbon.2018.03.051
复制
发表时间：
2018-07-01
期刊：
影响因子：
10.9
通讯作者：
Song, Chao
中科院分区：
文献类型：
--
作者：
Chen, Xu;Fan, Wenhui;Song, Chao
提出并研究了一种三维石墨烯超材料结构，该结构由石墨烯单层覆盖的介电柱阵列和下面的金属层组成，可以在太赫兹波入射下实现多种等离子体共振模式的高效激发。多个等离子体共振模式对分析物折射率和厚度的变化高度敏感，每个共振模式的频率灵敏度分别可达每折射率单位1.402、1.687和1.643 THz。通过控制石墨烯的费米能级，可以动态地调谐谐振频率。此外，该结构具有三个吸收峰，吸收率大于95%，对横向电磁波具有偏振不敏感性，在宽入射角范围内有很好的吸收性能。该结构可用于有源THz等离子体激元器件，如多通道传感器和吸收器。(C)2018爱思唯尔有限公司版权所有。
A three-dimensional graphene metamaterial structure consisting of dielectric pillar arrays covered by graphene monolayer with metal layer underneath is proposed and investigated, which can realize the efficient excitations of multiple plasmonic resonance modes under incident terahertz (THz) wave. The multiple plasmonic resonance modes are highly sensitive to the change of analyte refractive index and thickness, and the frequency sensitivity of each resonance mode can reach up to 1.402, 1.687 and 1.643 THz per refractive index unit, respectively. By controlling the Fermi level of graphene, the resonance frequency can be tuned dynamically. Moreover, the proposed structure has three absorption peaks with absorptivity more than 95%, it is polarization-insensitive and can perform very well in a wide incident angles for transverse electric and transverse magnetic waves. This proposed structure can be utilized for active THz plasmonic devices such as multiple channel sensors and absorbers. (C) 2018 Elsevier Ltd. All rights reserved.