Table 4.

Summarizes the performance parameters bimetallic layered structures with different d₁ and d₂ for mechanism 3 measurement.

SPR Measurement Mechanism 3
Operating point	Silver thickness (d1) nm	Gold thickness (d2) nm	Incident wavelength λ(nm)	Incident angle sinθ0	Rp	Sensitivity (S) 1/V	S/Rp	Figure of Merit (FoM) 1/V
‘A’	31.0	15.0	994.5	0.8994	4.30 × 10−7	14.23 × 10−4	3306	0.0052
‘B’	25.5	20.0	632.9	0.9464	1.89 × 10−9	7.48 × 10−4	396,777	0.6246
‘C’	20.5	25.0	965.9	0.9016	1.79 × 10−8	9.04 × 10−4	50,556	0.0796
‘D’	15.8	30.0	814.5	0.9130	9.96 × 10−7	10.86 × 10−4	1,090	0.0017