基于皮秒脉冲诱导透明（PIT）现象和洛伦兹理论的新型太赫兹光开关

Novel terahertz optical switch based on PIT phenomenon and Lorentz theory.

作者信息

Zhu Jun, Chen Xiner, Qin Liuli

机构信息

Guangxi Key Laboratory of Brain-inspired Computing and Intelligent Chips, School of Electronic and Information Engineering, Guangxi Normal University, Guilin 541004, China.

School of Electronic and Information Engineering/School of Integrated Circuits, Guangxi Normal University, Guilin 541004, China.

出版信息

iScience. 2024 Nov 1;27(12):111301. doi: 10.1016/j.isci.2024.111301. eCollection 2024 Dec 20.

DOI:10.1016/j.isci.2024.111301

PMID:39628586

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11612780/

Abstract

We propose and demonstrate a structure consisting of graphene rings and square rings that enables broadband and tunable plasmon-induced transparency (PIT) effects. Through coupled Lorentz model analysis, we attribute the transmission window at 2.1 THz to the interference between the equipartitioned exciton resonance of the graphene ring pairs and the inductive-capacitive resonance of the graphene square ring pairs. We also investigate the effect of the variation of the rotation angle of the internal graphene square ring pair on the transmission characteristics. The structure not only achieves a maximum modulation depth (MDA) of 91%, insertion loss (IL) and extinction ratio (ER) of 0.3 dB and 10.94 dB, respectively, but also achieves a maximum detection sensitivity of 0.96 THz/refractive index unit (RIU). In contrast, this study achieves more than 90% modulation amplitude in the range of 0.3 THz with a simple design structure, providing new insights for research and applications in related fields.

摘要

我们提出并展示了一种由石墨烯环和方环组成的结构，该结构能够实现宽带和可调谐的表面等离激元诱导透明（PIT）效应。通过耦合洛伦兹模型分析，我们将2.1太赫兹处的透射窗口归因于石墨烯环对的均分激子共振与石墨烯方环对的电感 - 电容共振之间的干涉。我们还研究了内部石墨烯方环对旋转角度的变化对传输特性的影响。该结构不仅实现了91%的最大调制深度（MDA）、分别为0.3分贝和10.94分贝的插入损耗（IL）和消光比（ER），还实现了0.96太赫兹/折射率单位（RIU）的最大检测灵敏度。相比之下，本研究通过简单的设计结构在0.3太赫兹范围内实现了超过90%的调制幅度，为相关领域的研究和应用提供了新的见解。