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

Chinese Physics B - Tập 30 Số 2 - Trang 024207 - 2021
Xiangxian Wang1, Jiankai Zhu1, Yueqi Xu1, Yunping Qi2, Liping Zhang1, Hua Yang1, Zao Yi3
1School of Science, Lanzhou University of Technology, Lanzhou 730050, China
2College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, 730070, China
3Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China

Tóm tắt

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.

Từ khóa


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Thông tin xuất bản

Chinese Physics B

Tập 30 Số 2

024207

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