基于双层石墨烯太赫兹超材料的四重表面等离激元诱导透明及动态调谐

Quadruple Plasmon-Induced Transparency and Dynamic Tuning Based on Bilayer Graphene Terahertz Metamaterial.

作者信息

Zhang Jiayu, Li Junyi, Chen Shuxian, Wen Kunhua, Liu Wenjie

机构信息

School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China.

Institute of Advanced Photonics Technology, School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, China.

出版信息

Nanomaterials (Basel). 2023 Sep 1;13(17):2474. doi: 10.3390/nano13172474.

DOI:10.3390/nano13172474

PMID:37686982

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10490479/

Abstract

This study proposes a terahertz metamaterial structure composed of a silicon-graphene-silicon sandwich, aiming to achieve quadruple plasmon-induced transparency (PIT). This phenomenon arises from the interaction coupling of bright-dark modes within the structure. The results obtained from the coupled mode theory (CMT) calculations align with the simulations ones using the finite difference time domain (FDTD) method. Based on the electric field distributions at the resonant frequencies of the five bright modes, it is found that the energy localizations of the original five bright modes undergo diffusion and transfer under the influence of the dark mode. Additionally, the impact of the Fermi level of graphene on the transmission spectrum is discussed. The results reveal that the modulation depths (MDs) of 94.0%, 92.48%, 93.54%, 96.54%, 97.51%, 92.86%, 94.82%, and 88.20%, with corresponding insertion losses (ILs) of 0.52 dB, 0.98 dB, 1.37 dB, 0.70 dB, 0.43 dB, 0.63 dB, 0.16 dB, and 0.17 dB at the specific frequencies, are obtained, achieving multiple switching effects. This model holds significant potential for applications in versatile modulators and optical switches in the terahertz range.

摘要

本研究提出了一种由硅-石墨烯-硅三明治结构组成的太赫兹超材料结构，旨在实现四重表面等离激元诱导透明（PIT）。这种现象源于结构内亮-暗模式的相互作用耦合。耦合模理论（CMT）计算结果与使用时域有限差分（FDTD）方法的模拟结果一致。基于五个亮模式共振频率处的电场分布，发现原始五个亮模式的能量局域化在暗模式的影响下发生扩散和转移。此外，还讨论了石墨烯费米能级对透射谱的影响。结果表明，在特定频率下获得了调制深度（MD）分别为94.0%、92.48%、93.54%、96.54%、97.51%、92.86%、94.82%和88.20%，相应的插入损耗（IL）分别为0.52 dB、0.98 dB、1.37 dB、0.70 dB、0.43 dB、0.63 dB、0.16 dB和0.17 dB，实现了多重开关效应。该模型在太赫兹波段的多功能调制器和光开关应用中具有巨大潜力。