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Chin. Phys. B, 2019, Vol. 28(4): 044201    DOI: 10.1088/1674-1056/28/4/044201

A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO2 spacer

Xiangxian Wang(王向贤)1, Jiankai Zhu(朱剑凯)1, Huan Tong(童欢)1, Xudong Yang(杨旭东)1, Xiaoxiong Wu(吴枭雄)1, Zhiyuan Pang(庞志远)1, Hua Yang(杨华)1, Yunping Qi(祁云平)2
1 School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
2 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

A plasmonic refractive index (RI) sensor with high RI sensitivity based on a gold composite structure is proposed. This composite structure is constructed from a perfect gold nano-disk square array on a gold film, with a SiO2 spacer. The reflection spectra of the composite structure, with analyte RI in the range of 1.30 to 1.40, are theoretically studied using the finite-difference time-domain method. The incident light beam is partly coupled to the localized surface plasmons (LSP) of the single nano-disks and partly transferred to the propagating surface plasmons (PSP) by grating coupling. The reflectivity is nearly zero at the valley of the reflection spectrum because of the strong coupling between LSP and PSP. Also, the full width at half maximum (FWHM) of one of the surface plasmon polaritons (SPPs) modes is very narrow, which is helpful for RI sensing. An RI sensitivity as high as 853 nm/RIU is obtained. The influence of the structure parameters on the RI sensitivity and the sensor figure of merit (FOM) are investigated in detail. We find that the sensor maintains high RI sensitivity over a large range of periods and nano-disk diameters. Results of the theoretical simulation of the composite structure as a plasmonic sensor are promising. Thus, this composite structure could be extensively applied in the fields of biology and chemistry.

Keywords:  plasmonic sensor      refractive index      sensitivity      FOM  
Received:  30 October 2018      Revised:  09 January 2019      Accepted manuscript online: 
PACS:  42.25.-p (Wave optics)  
  42.70.-a (Optical materials)  
  42.79.-e (Optical elements, devices, and systems)  

Project supported by the National Natural Science Foundation of China (Grant Nos. 61865008 and 61505074), the Undergraduate Innovation Training Program of Gansu Province, China (Grant No. DC2018002), and the Undergraduate Innovation Training Program of Lanzhou University of Technology (Grant No. DC2018004).

Corresponding Authors:  Xiangxian Wang     E-mail:

Cite this article: 

Xiangxian Wang(王向贤), Jiankai Zhu(朱剑凯), Huan Tong(童欢), Xudong Yang(杨旭东), Xiaoxiong Wu(吴枭雄), Zhiyuan Pang(庞志远), Hua Yang(杨华), Yunping Qi(祁云平) A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO2 spacer 2019 Chin. Phys. B 28 044201

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