摘要
基于表面等离子亚波长结构的传输特性与光子局域特性,提出了一种单挡板金属-电介质-金属(MDM)波导耦合圆盘腔结构。由圆盘腔形成的两个孤立态与金属挡板形成的较宽的连续态干涉相消,形成两种不同模式的Fano共振。结合耦合模理论分析了该结构形成Fano共振的传输特性,用有限元分析法对结构进行模拟仿真,定量分析了结构参数对折射率传感特性的影响。结果表明:优化后的结构在两种模式下的优质因子分别为1.7×105和1.36×105,折射率灵敏度分别为710nm/RIU和1105nm/RIU,可为解决传感器在折射率测量时的交叉敏感问题提供理论参考。
We propose a single baffle metal-dielectric-metal（MDM）waveguide coupled disk cavity structure based on the transmission characteristics and photon local characteristics of the surface plasmonic sub-wavelength structures.Two discrete states are provided by the disk cavity,and a metal baffle is used to produce a continuous state.The discrete states coupled with the continuous state lead to two different modes of Fano resonance.Then,the transmission characteristics of the Fano resonance are analyzed with the coupled mode theory,and the finite element analysis is used to simulate.Moreover,the effects of the structural parameters on the refractive index sensing characteristics are quantitatively analyzed.The results show that,at the first mode,the figure of merit（FOM）and the refractive index sensitivity of the optimized structure can reach to 1.7×105 and 710 nm/RIU,respectively.For the second mode,they can reach to 1.36×105 and 1105 nm/RIU,respectively.The structure can provide a theoretical reference for solving the problem of cross-sensitivity of the sensor in refractive index measurement.
作者
韩帅涛
陈颖
邸远见
何磊
崔行宁
朱奇光
李少华
Han Shuaitao;Chen Ying;Di Yuanjian;He Lei;Cui Xingning;Zhu Qiguang;Li Shaohua(Hebei Province Key Laboratory of Test/Measurement Technology and Instrument,School of Electrical Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China;Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province,School of Information Science and Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China;Hebei Sailhero Environmental Protection Hi-tech Co.,Ltd.,Shijiazhuang,Hebei 050000,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2018年第10期325-331,共7页
Acta Optica Sinica
基金
国家自然科学基金(61201112
61475133)
河北省自然科学基金(F2016203188
F2016203245)
河北省普通高校学校青年拔尖人才计划(BJ2014056)
关键词
光学器件
表面等离子
波导
圆盘腔
单挡板
optical devices
surface plasma
waveguide
disk cavity
single baffle
