Fig. 8From: Fabrication of perfect plasmonic absorbers for blue and near-ultraviolet lights using double-layer wire-grid structuresThe color maps of the reflectance calculated using RCWA method. The color bar shows the magnitude of the reflectance. a For λ = 450 nm, Ag. b For λ = 450 nm, Al. c For λ = 375 nm, Ag. d For λ = 375 nm, Al. The detail structural parameter is shown in Table 1. The red dashed lines present the dispersion relationship of the Rayleigh anomaly [Eq. (1)] in the double-layer wire-grid structure for n = 1. In Panel (b), the white arrows display the dispersion relationship of the surface-plasmon polariton [Eq. (2)]Back to article page