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

doi:10.1088/1674-1056/28/4/044201

中国物理B ›› 2019, Vol. 28 ›› Issue (4): 44201-044201.doi: 10.1088/1674-1056/28/4/044201

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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), 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)

1 School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
2 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

收稿日期:2018-10-30 修回日期:2019-01-09 出版日期:2019-04-05 发布日期:2019-04-05
通讯作者: Xiangxian Wang E-mail:wangxx869@126.com
基金资助:
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).

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

Received:2018-10-30 Revised:2019-01-09 Online:2019-04-05 Published:2019-04-05
Contact: Xiangxian Wang E-mail:wangxx869@126.com
Supported by:
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).

摘要/Abstract

摘要：

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.

关键词: plasmonic sensor, refractive index, sensitivity, FOM

Abstract:

Key words: plasmonic sensor, refractive index, sensitivity, FOM

中图分类号: (Wave optics)

42.25.-p

42.70.-a (Optical materials) 42.79.-e (Optical elements, devices, and systems)

王向贤, 朱剑凯, 童欢, 杨旭东, 吴枭雄, 庞志远, 杨华, 祁云平. A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO₂ spacer[J]. 中国物理B, 2019, 28(4): 44201-044201.

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[J]. Chin. Phys. B, 2019, 28(4): 44201-044201.

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

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

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