Table 4.

Comparison of change in $R_{min}^L, {\theta }_{SPR}^L, T_{max}^L, SR{F}_{freq}^L$, sensitivity, FWHM, DA, FOM, and QF with the variation of the graphene layer (L) in the proposed SPR biosensor.

Graphene layer thickness	${\mathit{R}}_{\mathit{m}\mathit{i}\mathit{n}}^{\mathit{L}} \left[\mathit{\%}\right]$	${\mathit{\theta }}_{\mathit{S}\mathit{P}\mathit{R}}^{\mathit{L}}$ $\left[\mathbf{deg}\right]$	${\mathit{T}}_{\mathit{m}\mathit{a}\mathit{x}}^{\mathit{L}}$ $\left[\mathbf{dB}\right]$	$\mathit{S}\mathit{R}{\mathit{F}}_{\mathit{f}\mathit{r}\mathit{e}\mathit{q}}^{\mathit{L}}$ $\left[\mathbf{THz}\right]$	$\mathbf{\Delta }{\mathit{R}}_{\mathit{m}\mathit{i}\mathit{n}}^{\mathit{L}} [\%]$	$\mathbf{\Delta }{\mathit{\theta }}_{\mathit{S}\mathit{P}\mathit{R}}^{\mathit{L}}$ $\left[\mathbf{deg}\right]$	$\mathbf{\Delta }{\mathit{T}}_{\mathit{m}\mathit{a}\mathit{x}}^{\mathit{L}}$ $\left[\mathbf{dB}\right]$	$\mathbf{\Delta }\mathit{S}\mathit{R}{\mathit{F}}_{\mathit{F}\mathit{r}\mathit{e}\mathit{q}}^{\mathit{L}}$ $\left[\mathbf{THz}\right]$	S $\left[\mathbf{deg}/\mathbf{RIU}\right]$	FW-HM $\left[\mathbf{deg}\right]$	DA $[1/\mathbf{deg}]$	FOM $[{\mathbf{RIU}}^{-1}]$	QF $\left[\mathbf{deg}/\mathbf{RIU}\right]$
L = 0 × 0.34 nm	15.20	75.45	1.6409	1394.2	-	-	-	-	-	-	-	-	-
L = 1 × 0.34 nm	19.05	76.00	2.1133	1397.6	3.85	0.55	0.4724	3.40	18.33	0.38	2.63	48.24	26.53
L = 2 × 0.34 nm	22.99	76.55	2.6124	1400.9	7.79	1.10	0.9715	6.70	36.67	0.78	1.28	47.01	51.72
L = 3 × 0.34 nm	27.00	77.10	3.1464	1404.0	11.8	1.65	1.5055	9.80	55.00	1.22	0.82	45.08	74.39
L = 4 × 0.34 nm	31.04	77.60	3.7156	1406.8	15.84	2.15	2.0747	12.60	71.67	1.73	0.58	41.43	89.07
L = 5 × 0.34 nm	35.08	78.10	4.3201	1409.3	19.88	2.65	2.6792	15.10	88.33	2.31	0.43	38.24	101.3