Two-Dimensional Hole-Array Grating-Coupling-Based Excitation of Bloch Surface Waves for Highly Sensitive Biosensing

被引：0
作者：
Daohan Ge
Jianpei Shi
Ahmed Rezk
Chao Ma
Liqiang Zhang
Ping Yang
Shining Zhu
机构：
[1] Jiangsu University,School of Mechanical Engineering
[2] Nanjing University,National Laboratory of Solid State Microstructures, School of Physics
[3] Jiangsu University,Laboratory of Span
[4] Jiangsu University,Scale Design and Manufacturing for MEMS/NEMS/OEDS
来源：
Nanoscale Research Letters | 2019年 / 14卷
关键词：
2D grating; Bloch surface wave; Sensitivity; Refractive index sensors;
D O I：
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学科分类号：
摘要：
In this study, a surface diffraction two-dimensional (2D) grating structure was placed on the topmost layer of distributed Bragg reflectors (DBRs) for biosensing. Bloch surface wave (BSW) resonance was realized by coupling a 2D subwavelength hole-array grating and could be excited at different locations: the surface of 2D-grating layer or the inter-face between the DBR and bio-solution. Material losses in the multilayer dielectric were measured to test the robustness of this scheme. Both the surface diffraction-grating BSW (DG-BSW) and the alternative guided grating-coupled BSW (GC-BSW) configuration showed markedly enhanced angular sensitivity compared to conventional prism-coupled schematics. Exciting these modes using a grating-coupling technique appears to yield different extreme sensitivity modes with a maximum of 1190°/RIU for DG-BSW and 2255°/RIU for GC-BSW. Refractive index sensors with a high figure of merit may be realized via such compact configurations.
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