From: Two-Dimensional Hole-Array Grating-Coupling-Based Excitation of Bloch Surface Waves for Highly Sensitive Biosensing
No. of layers
Material
Sensitivity
Reference
3
Chalcogenide glasses/SiO2 (HLH)
128°/RIU
[24]
4
Ta2O5/SiO2
Experimental = 18°/RIU
[36]
2
Si/SiO2
900 nm/RIU or 27.3°/RIU
[37]
21
Porous silicon
72°/RIU or 2038 nm/RIU
[38, 39]
TiO2/SiO2
2255°/RIU
This work