Fig. 4From: Large-Area Structural Color Filtering Capitalizing on Nanoporous Metal-Dielectric-Metal Configurationa Top and cross-sectional views of the SEM images of the manufactured NAA films with different thicknesses of t2 = 110, 160, and 320 nm, respectively. b Top view of the SEM images of the proposed structure based on Al-coated NAA filmBack to article page