Fig. 4From: Infrared Plasmonic Refractive Index Sensor with Ultra-High Figure of Merit Based on the Optimized All-Metal Grating a Reflection spectra as a function of t 2. b Reflectivity of the resonance dip and its FWHM as functions of t 2. c FOM and FOM* as functions of t 2. Other parameters: p = 1200 nm, w = 622 nm, l = 420 nm, t 3 = 18 nm, and t 1 = 300 nm + t 2 Back to article page