Enhancing performance of a miniaturized surface plasmon resonance sensor in the reflectance detection mode using a waveguide-coupled bimetallic chip

Table 1 SPR parameters for WcBiM configurations when the refractive index is changed from 1.335 to 1.35

Configuration	Minimum reflectance	Resonance angle	Steepest slope	Reflectance at n= 1.335	Reflectance at n= 1.35	ΔR
	Minimum reflectance	Resonance angle	Steepest slope	Reflectance at n= 1.335	Reflectance at n= 1.35	(R_{n= 1.35} − R_{n= 1.335})
	(%)	(deg)	(Δ R/Δ θ)	(%)	(%)	(%)
Au(31 nm)/WG/Ag(25 nm)	0.005	64.63	−155.8	29.86	92.82	62.96
Au(25 nm)/WG/Ag(25 nm)	2.697	63.97	−156.0	33.51	93.78	60.27
Au(31 nm)/WG/Ag(20 nm)	4.608	64.77	−115.8	33.69	91.83	58.14
Au(31 nm)/WG/Ag(35 nm)	17.528	64.51	−181.7	39.97	93.03	53.06
Au(35 nm)/WG/Ag(25 nm)	1.507	65.00	−154.3	29.50	92.46	62.96