The Simulation of a Surface Plasmon Resonance Metallic Grating for Maximizing THz Sensitivity in Refractive Index Sensor Application

Figure 5

(a) FOM as a function of refractive index with a variation of H in an Au-coated PDMS grating with Λ = 190 μm, FF = 0.8, and t_m = 100 nm at the incident angle of 10°. (b) Sensitivity plot of the interested refractive range, 1.4 to 1.5, of the optimized grating structure with Λ = 190 μm, FF = 0.8, H = 85 μm, and t_m = 100 nm at the incident angle of 10°. The inset shows the resonance frequency f₀ of this grating for different compositions of gasoline-toluene mixture.

(a)

(b)