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

doi:10.1088/1674-1056/abd690

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.

Keywords: plasmonic sensor gold silicon grating

Received: 26 October 2020
Revised: 15 December 2020
Accepted manuscript online: 24 December 2020

PACS:	42.25.Bs	(Wave propagation, transmission and absorption)
	42.25.-p	(Wave optics)
	42.79.-e	(Optical elements, devices, and systems)

Fund: 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).

Corresponding Authors: ^†Corresponding author. E-mail: wangxx869@lut.edu.cn

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Xiangxian Wang(王向贤), Jiankai Zhu(朱剑凯), Yueqi Xu(徐月奇), Yunping Qi(祁云平), Liping Zhang(张丽萍), Hua Yang(杨华), and Zao Yi(易早) A novel plasmonic refractive index sensor based on gold/silicon complementary grating structure 2021 Chin. Phys. B 30 024207

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

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