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摘要

提出并研究了一种由三组明模组成的类电磁诱导透明太赫兹超材料结构. 两组具有相似共振频率的明模为两个弱杂化态, 能量在两个共振点之间来回振荡, 产生相消干涉, 在两个共振点之间产生透射窗口. 该超材料的三组明模两两耦合干涉产生双频段的类电磁诱导透明效应. 根据仿真曲线和电场分布, 分析了超材料的类电磁诱导透明形成机理. 此外, 通过仿真和计算研究了超材料的传感特性, 在待测物的最佳厚度下, 两个类电磁诱导透明窗口的折射率灵敏度可高达451.92和545.31 GHz/RIU. 通过对6种石油产品的传感仿真, 验证了双频段超材料比单频段超材料在介电常数匹配方面更具有优势. 还研究了所设计的超材料在慢光效应下的特性. 这两个窗口的最大群时延分别可达9.98和6.23 ps, 此超材料在高灵敏度传感器和慢光器件领域具有重要的应用价值.

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Abstract

Electromagnetically induced transparency (EIT) is a quantum interference phenomenon in a three-level atomic system. The generation of quantum interference effect significantly reduces the light absorptivity of the specific frequency that is strongly absorbed, and produces a sharp “transmission window” in the resonance absorption region. The EIT is usually accompanied by strong dispersion, which significantly reduces the group velocity of light and enhances the nonlinear interaction. The EIT phenomenon of atomic system usually needs to be observed at very low temperature or high intensity laser, which is a very serious challenge for the application of EIT technology. The simulation of electromagnetically induced transparency using metamaterials can effectively break through these limitations. In this work, an electromagnetically induced transparency-like terahertz metamaterial structure with three bright modes is proposed and investigated. Two weakly hybrid states are composed of two bright modes with similar resonant frequencies. The energy oscillates back and forth between the two modes, and a transparent window is generated between the two resonance points. The designed metamaterial is composed of three groups of bright modes with adjacent resonant frequencies, and the three groups of bright modes are coupled to produce two transparent windows. The electromagnetically induced transparency-like formation mechanism is analyzed based on the simulation curve and electric field distribution. In addition, the sensing properties of metamaterial are determined by simulation and calculation, and the refractive index sensitivities of the two windows can be as high as 451.92 GHz/RIU and 545.31 GHz/RIU under the optimal thickness of the measured substances. Through the sensing simulation of six petroleum products, it is verified that the dual-band has more excellent advantages in dielectric constant matching than the single frequency band. The characteristics of the designed metamaterial in the slow light effect are also studied. The maximum group delay times of the two windows can reach 9.98 ps and 6.23 ps. Therefore, the structure is considered to have an important application value in the field of high sensitivity sensors and slow light devices.

Keywords:

electromagnetically induced transparency-like/
terahertz metamaterials/
sensing characteristics/
slow light characteristics

作者及机构信息

通信作者:王鑫,wangxin219@imu.edu.cn; 王俊林,wangjunlin@imu.edu.cn;

基金项目:国家自然科学基金(批准号: 51965047)、内蒙古自然科学基金(批准号: 2021MS06012)和内蒙古自治区科技计划项目(批准号: 2020GG0185)资助的课题.

Authors and contacts

Corresponding author:Wang Xin,wangxin219@imu.edu.cn; Wang Jun-Lin,wangjunlin@imu.edu.cn;

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 51965047), the Natural Science Foundation of Inner Mongolia Autonomous Region, China (Grant No. 2021MS06012), and the Science and Technology Planning Project of Inner Mongolia Autonomous Region, China (Grant No. 2020GG0185).

文章全文: translate this paragraph

参考文献

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施引文献

下载: 全尺寸图片幻灯片

The measured substance	ε	Frequency shift /GHz		Calculated ε		Calculated average ε
The measured substance	ε	First	Second	First	Second	Calculated average ε
JP-4	1.7	133.85	171.83	1.68	1.73	1.705
Petroleum ether	1.8	152.73	188.22	1.79	1.81	1.8
90#	2.01	188.82	227.67	2.01	2.01	2.01
93#	2.11	201.44	248.53	2.09	2.12	2.105
Transmission oil	2.2	218.42	265.2	2.2	2.21	2.205
97#	2.25	222.98	270.68	2.23	2.24	2.235

下载: 导出CSV

Performance index	Ref.[34]	Ref.[35]	Ref.[36]	Ref.[37]	Ref.[38]	Ref.[39]	Ref.[40]	Ref.[41]	This paper
Performance index	2018	2019	2020	2021	2019	2020	2020	2021	—
Q	58	22.05	30.5	—	—	—	11.88	—	26.63	19.46
S/(GHz·RIU^–1)	105	300	280	229.7	—	—	—	—	452	545
FOM	7.5	2.94	8.54	—	—	—	—	—	4.75	6.21
$ {\tau }_{\mathrm{g}} $/ps	—	—	—	—	6.74	7	7.28	5.5	9.98	6.23

下载: 导出CSV

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