Enhanced Sensitivity of Surface Plasmon Resonance Biosensor Functionalized with Doped Polyaniline Composites for the Detection of Low-Concentration Acetone Vapour

Table 4

Optical constant values of gold film at different wavelengths of light sources.

Wavelength (nm)	Refractive index ()	Extinction coefficient ()	Real part dielectric constant
633	0.19404	3.5934	-12.875
589	0.26146	3.1019	-9.5532
546	0.39631	2.5581	-6.3871
441	1.55410	1.9847	-1.5239
436	1.57050	1.9933	-1.5067