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Table 1 Comparison of layer number, material, and sensitivity of proposed structure with other sensors in literature

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]

4

TiO2/SiO2

2255°/RIU

This work

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