Figure 12.

Performance parameters calculated by varying silver layer thickness d₁ from 15 nm to 50 nm and gold thickness d₂ of 15 nm (solid blue curve), 20 nm (solid red curve), 25 nm (solid yellow curve) and 30 nm (solid purple curve) when the incident wavelength λ was fixed at 632.8 nm and the applied potential ψ₀ of 0 V at (a) minimum R_p; (b) FWHM. (c) Sensitivity calculated by comparing the plasmonic wave vector positions of applied potentials ψ₀ of 0 V and 0.2 V and (d) FoM calculated from Figure 12b,c.