基于耦合腔类电磁诱导透明的气体传感研究  

Study of Gas Sensing Based on Electromagnetic Induced Transparency-Like Effect in Coupled Microcavities

作　　者：谢显龙 刘波 徐文斌 王梦宇 Xie Xianlong;Liu Bo;Xu Wenbin;Wang Mengyu(Key Laboratory for Optoelectronic Information Perception and Instrumentation of Jiangxi Province,School of the Testing and Photoelectric Engineering,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China;Key Laboratory of Nondestructive Test(Ministry of Education),Nanchang Hangkong University,Nanchang 330063,Jiangxi,China;National Key Laboratory of Scattering and Radiation,Beijing 100854,China)

机构地区：[1]南昌航空大学测试与光电工程学院光电信息感知技术与仪器江西省重点实验室,江西南昌330063 [2]南昌航空大学无损检测教育部重点实验室,江西南昌330063 [3]散射辐射全国重点实验室,北京100854

出　　处：《中国激光》2025年第1期234-243,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(62465014);赣鄱俊才支持计划(20232BCJ23096);江西省自然科学基金(20232BAB212016,20224BAB202006,20202BABL212011)。

摘　　要：电磁诱导透明(EIT)效应在当前光学通信、光脉冲储存和量子信息处理等领域中有着很高的应用价值,耦合腔因其高局域化光场、可调控性强、结构简单等优点成为研究电磁诱导透明的极佳介质。基于耦合模理论探究了耦合腔作为类电磁诱导透明激发介质的可行性和优越性。利用时域有限差分法仿真实现了耦合腔中类EIT效应的激发,并对工业上常见气体进行了选择性检验,最后探究了耦合腔的间距对其类EIT激发情况及气体传感灵敏度和检测极限性能的影响。类EIT被激发时灵敏度有所降低但基本稳定且能达到205.166 nm/RIU(RIU为折射率单位),检测极限值达到了7.46×10^(-4)RIU,是未激发时的4.16倍。结果表明耦合腔可为电磁诱导透明提供优势平台,为实现易调控和高性能的光学传感器件提供了新的思路。Objective This study explores the feasibility and superiority of coupled cavities as electromagnetically induced transparent(EIT)excitation media.The EIT effect is realized by the coupled cavity structure,and its performance in gas sensing is investigated,including its sensitivity,detection limit,and selective recognition ability for different gases.In addition,we analyze the influence of the coupling cavity spacing on the EIT excitation and gas sensing performance to provide new ideas for the development of highperformance optical sensor devices.Methods The study is based on the coupled-mode theory,and the simulation model of the EIT-like effect of the coupled cavity is constructed using the finite difference in the time domain(FDTD)method for simulation.By optimizing the structure of the doublering coupled cavity,the EIT-like effect is realized,and the refractive index sensing tests of several gases(hydrogen,oxygen,carbon dioxide,and chlorine)that are conventionally employed in the industry are carried out using this effect.The size,spacing,intrinsic loss,and coupling loss of the coupling cavity are considered in this study,and the EIT-like effect is modulated by changing these parameters and analyzing their effects on the gas sensing performance.Results and Discussions The results show that the coupling cavity can be employed effectively as an excitation medium for the EIT-like effect and that when the EIT is excited,its sensitivity is stable and can reach 205.166 nm/RIU,despite the decrease in sensitivity.The limit of detection(LOD)value reaches 7.46×10-4 RIU,and it is optimized by a factor of 4.16 with respect to that of the unexcited EIT.This indicates that the coupling cavity structure has significant potential for applications in optical sensing,especially for improving the sensitivity and detection limit of the sensor.The effect of the coupling-cavity spacing on the excitation of the EIT is discussed in this paper.Researchers have observed the generation and variation of EIT-like effects by varying the

关 键 词：电磁诱导透明 耦合腔 微腔 气体传感 检测极限 

分 类 号：O436[机械工程—光学工程]