含双挡板金属-电介质-金属波导耦合方形腔的独立调谐双重Fano共振特性
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摘要
基于表面等离子激元在亚波长结构的传输特性,设计了一种含双挡板金属-电介质-金属波导耦合两个方形腔的结构.由F-P谐振腔产生的宽谱模式与两个方形谐振腔产生的两个窄谱模式发生干涉作用,形成了独立调谐的双重Fano共振,而且可以通过改变两个方形腔的大小及填充介质实现双重Fano共振的独立调谐.基于耦合模理论,定性分析了该结构产生双重Fano共振的机理.利用有限元仿真的方法,定量分析了结构参数对可独立调谐双重Fano共振和折射率传感特性的影响.结果表明,优化参数后该结构的灵敏度分别高达1020和1120 nm/RIU, FOM值分别高达3.59×10~5和1.17×10~6.该结构可为超快光开关、多功能高灵敏度传感器和慢光器件的光学集成提供有效的理论参考.
A metal-dielectric-metal(MDM) waveguide coupling two square cavities with double baffles is designed in this paper based on the transmission characteristics of surface plasmon polaritons in subwavelength structure.The independent tuning of the dual Fano resonance is implemented by the interference between the widespectrum mode generated by the F-P(Fabry Perot) cavity and the two narrow-spectrum modes generated by the two square cavities. Moreover, the independent tuning of the dual Fano resonance can be achieved by changing the sizes of the two square cavities and filling medium. The coupled-mode theory(CMT) is adopted to analyze the transmission characteristics of the dual Fano resonance. The structure is simulated by the finite element method to quantitatively analyze the influence of structural parameters on the independent tuning of the dual Fano resonance and the refractive index sensing characteristics. The proposed sensor yields respectively sensitivity higher than 1020 nm/RIU and 1120 nm/RIU and a figure of merit of 3.29 × 10~5 and 1.17 × 10~6 by optimizing the geometry parameters. This structure provides an effective theoretical reference in the optical integration of ultra-fast optical switches, multi-function high-sensitivity sensors and slow-light devices.
A metal-dielectric-metal(MDM) waveguide coupling two square cavities with double baffles is designed in this paper based on the transmission characteristics of surface plasmon polaritons in subwavelength structure.The independent tuning of the dual Fano resonance is implemented by the interference between the widespectrum mode generated by the F-P(Fabry Perot) cavity and the two narrow-spectrum modes generated by the two square cavities. Moreover, the independent tuning of the dual Fano resonance can be achieved by changing the sizes of the two square cavities and filling medium. The coupled-mode theory(CMT) is adopted to analyze the transmission characteristics of the dual Fano resonance. The structure is simulated by the finite element method to quantitatively analyze the influence of structural parameters on the independent tuning of the dual Fano resonance and the refractive index sensing characteristics. The proposed sensor yields respectively sensitivity higher than 1020 nm/RIU and 1120 nm/RIU and a figure of merit of 3.29 × 10~5 and 1.17 × 10~6 by optimizing the geometry parameters. This structure provides an effective theoretical reference in the optical integration of ultra-fast optical switches, multi-function high-sensitivity sensors and slow-light devices.
引文
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[9]Chen Z,Yu L 2014 IEEE Photonics J.6 1
[10]Li C,Li S L,Wang Y L,Jiao R Z,Wang L L,Yu L 2017IEEE Photonics J.99 1
[11]Wang D Q,Yu X L,Yu Q M 2013 Appl.Phys.Lett.103 824
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[14]Zhang Z D,Wang H Y,Zhang Z Y 2013 Plasmonics 8 797
[15]Rakhshani M R,Mansouri-Birjandi M A 2016 IEEE Sens.J.16 3041
[16]Kim J,Soref R,Buchwald W R 2010 Opt.Express 18 17997
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[19]Lu H,Liu X,Mao D 2012 Phys.Rev.A 85 53803
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[21]Wu C,Ding H F,Huang T Y,Wu X,Chen B W,Ren K X,Fu S N 2017 Plasmonics 13 251
[22]Wen K H,Hu Y H,Chen L,Zhou J Y,Liang L,Meng Z M2016 Plasmonics 11 315