Extremely High Sensitive Plasmonic Refractive Index Sensors Based on Metallic Grating

被引:28
作者
Li, X. F. [1 ]
Yu, S. F. [1 ]
机构
[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
关键词
Surface plasmons; Refractive index sensors; Rigorous coupled-wave approach; Metallic grating; Diffracted waves; RESONANCE SENSORS; DIFFRACTION GRATINGS; OPTIMIZATION;
D O I
10.1007/s11468-010-9155-6
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This work shows that a grating-based surface plasmon (SP) resonance sensing system can exhibit extremely high sensitivity to detect a small change of refractive index in an analyte. The corresponding sensitivity can be much higher than that of the prism-based systems. Both analytical calculation and rigorous coupled-wave analysis are used to study the angular sensitivity of the system. It is found that the system's sensitivity can be over 600A degrees per unit index change if (1) first-order diffracted wave is chosen to excite SP mode, (2) large SP resonant angles are used in the operation, and (3) grating filling factor is selected to be varied between 0.3 and 0.7. Furthermore, the sensing system has the best performance for detecting low-index analyte with a small change of refractive index.
引用
收藏
页码:389 / 394
页数:6
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