中国物理B ›› 2021, Vol. 30 ›› Issue (2): 24207-0.doi: 10.1088/1674-1056/abd690

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  • 收稿日期:2020-10-26 修回日期:2020-12-15 接受日期:2020-12-24 出版日期:2021-01-18 发布日期:2021-01-18

A novel plasmonic refractive index sensor based on gold/silicon complementary grating structure

Xiangxian Wang(王向贤)1,†, Jiankai Zhu(朱剑凯)1, Yueqi Xu(徐月奇)1, Yunping Qi(祁云平)2, Liping Zhang(张丽萍)1, Hua Yang(杨华)1, and Zao Yi(易早)3   

  1. 1 School of Science, Lanzhou University of Technology, Lanzhou 730050, China; 2 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China; 3 Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China
  • Received:2020-10-26 Revised:2020-12-15 Accepted:2020-12-24 Online:2021-01-18 Published:2021-01-18
  • Contact: †Corresponding author. E-mail: wangxx869@lut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61865008) and the Scientific Research Fund of Sichuan Provincial Science and Technology Department, China (Grant No. 2020YJ0137).

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Abstract: A novel complementary grating structure is proposed for plasmonic refractive index sensing due to its strong resonance at near-infrared wavelength. The reflection spectra and the electric field distributions are obtained via the finite-difference time-domain method. Numerical simulation results show that multiple surface plasmon resonance modes can be excited in this novel structure. Subsequently, one of the resonance modes shows appreciable potential in refractive index sensing due to its wide range of action with the environment of the analyte. After optimizing the grating geometric variables of the structure, the designed structure shows the stable sensing performance with a high refractive index sensitivity of 1642 nm per refractive index unit (nm/RIU) and the figure of merit of 409 RIU-1. The promising simulation results indicate that such a sensor has a broad application prospect in biochemistry.

Key words: plasmonic sensor, gold, silicon, grating

中图分类号:  (Wave propagation, transmission and absorption)

  • 42.25.Bs
42.25.-p (Wave optics) 42.79.-e (Optical elements, devices, and systems)