Figure 3.

FDTD simulations of the proposed sensor and sensing performance evaluation. (a) SEM photograph of the fabricated plasmonic nanogratings. (b) Experimental and simulated optical reflectance spectra under TM-polarization with a light incident angle of 60° for the nanostructured plasmonic sensor fabricated. (c) Simulated electric field distribution for the 80 nm gold thickness layer on the polycarbonate nanograting under TM-polarization for a light incidence angle of 60°. (d) Displacement of the reflectance spectra for the plasmonic nanogratings based sensor fabricated with different refractive index solutions based on ethanol-water mixtures. (e) Calibration curve and bulk sensitivity determination for the 80 nm gold thickness layer sensor at a light incidence angle of 60°.