Fig. 2From: Omnidirectional Absorber by the Void Plasmon Effect in the Visible Region with Greatly Enhanced Localized Electric Fielda Calculated absorption spectra of the proposed nanohole array-based absorber compared with the FP absorber without nanoholes in the top layer. b Calculated absorption spectra using different combinations of three layers as well as 20 nm of silver. TL, top layer; ML, middle layer; BL, bottom layerBack to article page