基于石墨烯超材料的五元等离子体诱导透明及其多功能应用的数值与理论研究

IF 3 Q2 PHYSICS, CONDENSED MATTER
Xiaodong Zeng, Qingwei Zhao, Ke Chen, Yang Yang, Shunyu Yao, Yiping Xu, Xin Huang, Wenxing Yang
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引用次数: 0

摘要

提出了一种由四个同心石墨烯方形环和硅衬底组成的周期太赫兹超材料结构。当入射光照射在太赫兹波段范围内时,在该结构的透射光谱中产生了五倍等离子体诱导的透明效应。然后,不同石墨烯结构作用的亮模式和暗模式的相互作用以及整个结构在6个透射倾角频率下的电场分布可以很好地解释五倍深坑效应形成的物理机制。时域有限差分数值模拟结果与耦合模式理论(CMT)在单层石墨烯不同费米能级下的理论计算结果吻合较好。通过调整石墨烯的费米能级得到一组八通道异步开关、一组九通道异步开关、两组五通道同步开关和一组四通道同步开关。这些多通道光开关的最大调制深度可达0.9985,相应的插入损耗和消光比分别达到0.382 dB和28.2179 dB。此外,还研究了整个结构的折射率传感特性。所得灵敏度最大值为1.151 THz/RIU,优值图(FOM)最大值为53.5059。最后,对整个结构的慢光效应进行了研究。最大群时延达到2.2211ps,最大群折射率达到3331.65。高性能、多功能的石墨烯太赫兹超材料为多通道光开关、光存储、折射率传感器件的设计提供了重要的指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical and theoretical research on quintuple plasmon-induced transparency based on graphene metamaterial and its multi-function application
A periodic terahertz metamaterial structure consisting of four concentric graphene square rings and the silicon substrate is proposed. Upon the irradiation of the incident light within the range of the THz band, a quintuple plasma-induced transparency (PIT) effect in the transmission spectrum of the proposed structure is produced. Then, the interaction between bright mode and dark mode acted by different graphene structures and the electric field distributions of the whole structure in the six transmission dip frequencies can well explain the forming physical mechanism of the quintuple-PIT effect. The results obtained by the FDTD numerical simulation agree well with those achieved by the coupling mode theory (CMT) theoretical calculations under different Fermi levels of the monolayer graphene. A set of eight-channel asynchronous switches, a set of nine-channel asynchronous switches, two sets of five-channel synchronous switches and a set of four-channel synchronous switches are obtained by adjusting the Fermi levels of graphene. The maximum modulation depth of these multi-channel optical switches is up to 0.9985, the corresponding insertion loss and extinction ratio reach 0.382 dB and 28.2179 dB, respectively. Moreover, the refractive index sensing characteristics of the whole structure are studied. The obtained maximum values of sensitivity and figure of merit (FOM) are up to 1.151 THz/RIU and 53.5059, separately. Finally, the slow light effect of the whole structure is also studied. The maximum group time delay and the corresponding group refractive index separately reach 2.2211ps and 3331.65. The high-performance and multi-function graphene terahertz metamaterial provides a significant guide for the design of the multi-channel optical switching, optical storage, refractive index sensing devices.
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