中国物理B ›› 2020, Vol. 29 ›› Issue (11): 114204-.doi: 10.1088/1674-1056/abb229

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Jiankai Zhu(朱剑凯)1, Xiangxian Wang(王向贤)1,†(), Xiaoxiong Wu(吴枭雄)1, Yingwen Su(苏盈文)1, Yueqi Xu(徐月奇)1, Yunping Qi(祁云平)2, Liping Zhang(张丽萍)1, Hua Yang(杨华)1   

  • 收稿日期:2020-06-11 修回日期:2020-06-29 接受日期:2020-08-25 出版日期:2020-11-05 发布日期:2020-11-03

Ultra wide sensing range plasmonic refractive index sensor based on nano-array with rhombus particles

Jiankai Zhu(朱剑凯)1, Xiangxian Wang(王向贤)1, †, Xiaoxiong Wu(吴枭雄)1, Yingwen Su(苏盈文)1, Yueqi Xu(徐月奇)1, Yunping Qi(祁云平)2, Liping Zhang(张丽萍)1, and Hua Yang(杨华)1$   

  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
  • Received:2020-06-11 Revised:2020-06-29 Accepted:2020-08-25 Online:2020-11-05 Published:2020-11-03
  • Contact: Corresponding author. E-mail: wangxx869@lut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China (Grant Nos. 61865008 and 61505074) and the HongLiu First-Class Disciplines Development Program of Lanzhou University of Technology.

Abstract:

We propose a two-dimensional metal grating with rhombus particles on a gold film structure for refractive index sensing due to its perfect absorption at near-infrared wavelength. Via two-dimensional metal grating coupling, the incident light energy is effectively transformed into the surface plasmons which propagate along the upper surface of the gold film and interact with the surrounding environment in a wide range. The plasmonic resonance mechanism of the structure is discussed in detail by theoretical analysis and finite-difference time-domain method. After optimizing the geometrical parameters, the designed structure shows the sensing performance with a refractive index sensitivity of 1006 nm/RIU. More importantly, this plasmonic refractive index sensor achieves an ultra wide refractive index sensing range from 1.0 to 2.4 with a stable sensing performance. The promising simulation results of the structure show that the sensor has a broad application prospect in the field of biology and chemistry.

Key words: plasmonic sensor, refractive index, sensitivity, figure of merit (FOM)