(a) Schematic of a metallic grating with geometric parameters. (b) Simulation transmission spectra under a p-polarized and an s-polarized incidence. Field distributions (|E|/E₀|) at the first-order resonant wavelength (λ = 900 nm) under incident light of (c) p-polarizaion and (d) s-polarization. (e) Resonant wavelength as a function of P. (f) Peak transmittance and (g) bandwidth of the metallic filter as functions of the resonant wavelengths.