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

作     者：王向贤 朱剑凯 徐月奇 祁云平 张丽萍 杨华 易早 Xiangxian Wang;Jiankai Zhu;Yueqi Xu;Yunping Qi;Liping Zhang;Hua Yang;Zao Yi

作者机构：School of ScienceLanzhou University of TechnologyLanzhou 730050China College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070China Joint Laboratory for Extreme Conditions Matter PropertiesSouthwest University of Science and TechnologyMianyang 621010China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2021年第30卷第2期

页      面：313-318页

核心收录：

学科分类：08[工学] 080202[工学-机械电子工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0704[理学-天文学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.61865008) the Scientific Research Fund of Sichuan Provincial Science and Technology Department,China(Grant No.2020YJ0137)。 

主　　题：plasmonic sensor gold silicon grating 

摘      要：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.