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Chin. Phys. B, 2020, Vol. 29(6): 067303    DOI: 10.1088/1674-1056/ab888c

Multiple Fano resonances in metal-insulator-metal waveguide with umbrella resonator coupled with metal baffle for refractive index sensing

Yun-Ping Qi(祁云平)1,3, Li-Yuan Wang(王力源)1, Yu Zhang(张宇)1, Ting Zhang(张婷)1, Bao-He Zhang(张宝和)1, Xiang-Yu Deng(邓翔宇)1, Xiang-Xian Wang(王向贤)2
1 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;
2 School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
3 Engineering Research Center of Gansu Provence for Intelligent Information Technology and Application, Northwest Normal University, Lanzhou 730070, China
Abstract  A single baffle metal-insulator-metal (MIM) waveguide coupled with a semi-circular cavity and a cross-shaped cavity is proposed based on the multiple Fano resonance characteristics of surface plasmon polaritons (SPPs) subwavelength structure. The isolated state formed by two resonators interferes with the wider continuous state mode formed by the metal baffle, forming Fano resonance that can independently be tuned into five different modes. The formation mechanism of Fano resonance is analyzed based on the multimode interference coupled mode theory (MICMT). The finite element method (FEM) and MICMT are used to simulate the transmission spectra of this structure and analyze the influence of structural parameters on the refractive index sensing characteristics. And the transmission responses calculated by the FEM simulation are consistent with the MICMT theoretical results very well. The results show that the figure of merit (FOM) can reach 193 and the ultra-high sensitivity is 1600 nm/RIU after the structure parameters have been optimized, and can provide theoretical basis for designing the high sensitive refractive index sensors based on SPPs waveguide for high-density photonic integration with excellent performance in the near future.
Keywords:  surface plasmon polaritons      MIM waveguide      Fano resonance      finite element method  
Received:  19 January 2020      Revised:  02 April 2020      Accepted manuscript online: 
PACS:  73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))  
  42.79.-e (Optical elements, devices, and systems)  
  71.36.+c (Polaritons (including photon-phonon and photon-magnon interactions))  
  71.38.-k (Polarons and electron-phonon interactions)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61367005 and 61865008) and the Natural Science Foundation of Gansu Province, China (Grant No. 17JR5RA078).
Corresponding Authors:  Yun-Ping Qi     E-mail:

Cite this article: 

Yun-Ping Qi(祁云平), Li-Yuan Wang(王力源), Yu Zhang(张宇), Ting Zhang(张婷), Bao-He Zhang(张宝和), Xiang-Yu Deng(邓翔宇), Xiang-Xian Wang(王向贤) Multiple Fano resonances in metal-insulator-metal waveguide with umbrella resonator coupled with metal baffle for refractive index sensing 2020 Chin. Phys. B 29 067303

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