Novel terahertz optical switch based on PIT phenomenon and Lorentz theory

IF 4.6 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES iScience Pub Date : 2024-11-01 DOI:10.1016/j.isci.2024.111301

Jun Zhu , Xiner Chen , Liuli Qin

引用次数: 0

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.

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基于 PIT 现象和洛伦兹理论的新型太赫兹光开关

我们提出并展示了一种由石墨烯环和方形环组成的结构，这种结构可实现宽带和可调的等离子诱导透明（PIT）效应。通过耦合洛伦兹模型分析，我们将 2.1 THz 的传输窗口归因于石墨烯环对的等分激子共振与石墨烯方环对的电感电容共振之间的干扰。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 dB 和 10.94 dB 的插入损耗 (IL) 和消光比 (ER)，还实现了 0.96 THz/折射率单位 (RIU) 的最大探测灵敏度。相比之下，本研究以简单的设计结构在 0.3 THz 范围内实现了 90% 以上的调制幅度，为相关领域的研究和应用提供了新的启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

iScience Multidisciplinary-Multidisciplinary

CiteScore

7.20

自引率

1.70%

发文量

1972

审稿时长

6 weeks

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