Table 1.

FoM of sensor performance for each central wavelength.

$\mathit{\lambda }$	Sensitivity	Hysteresis (%)	${\mathit{R}}^2$	FoM
430 nm	13.03	1.78	0.997	6.81
530 nm	18.93	1.66	0.998	9.76
660 nm	8.56	1.44	0.998	4.58
870 nm	0.94	2.60	0.996	0.77
950 nm	32.63	2.73	0.993	16.58