中国物理B ›› 2020, Vol. 29 ›› Issue (6): 67303-067303.doi: 10.1088/1674-1056/ab888c

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

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), 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)   

  1. 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
  • 收稿日期:2020-01-19 修回日期:2020-04-02 出版日期:2020-06-05 发布日期:2020-06-05
  • 通讯作者: Yun-Ping Qi E-mail:yunpqi@126.com
  • 基金资助:
    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).

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. 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
  • Received:2020-01-19 Revised:2020-04-02 Online:2020-06-05 Published:2020-06-05
  • Contact: Yun-Ping Qi E-mail:yunpqi@126.com
  • Supported by:
    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).

摘要: 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.

关键词: surface plasmon polaritons, MIM waveguide, Fano resonance, finite element method

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.

Key words: surface plasmon polaritons, MIM waveguide, Fano resonance, finite element method

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
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)