Theoretical Study of Plasmonically Induced Transparency Effect in Arrays of Graphene-Based Double Disk Resonators

Abstract In this paper, we consider coupled disk-shaped resonators separated by a thin dielectric substrate that can be used as frequency-tunable filters or as electromagnetic switches in the terahertz frequency band. The two disks are electromagnetically coupled and resonate with dipole plasmonic modes. By using a Temporal Coupled-Mode Theory based approach, we show how to analytically calculate the frequency response of such structures.The analytical results are in good agreement with those obtained from computational simulations based on the finite element method.

摘要 本文研究了以薄介电基板（dielectric substrate）分隔的耦合盘状谐振器，该类结构可在太赫兹频段（terahertz frequency band）中用作频率可调滤波器或电磁开关。两个圆盘之间存在电磁耦合，并以偶极子等离激元模式（dipole plasmonic modes）谐振。通过采用基于时域耦合模理论（Temporal Coupled-Mode Theory）的分析方法，我们给出了这类结构频率响应的解析计算方法。该解析结果与基于有限元法（finite element method）的数值仿真结果吻合良好。