Table 2.

SPR biosensor thicknesses and RI at 633 nm

Serial no	Material used	Thickness	Refractive index	References
1	Ag	55 nm	0.056253 + 4.2760 × 1i	[46]
2	Si3N4	5 nm	2.0394	[44]
3	BP	0.53 nm	3.5 + 0.01 × 1i	[47]