Fig. 1From: Engineering the Complex-Valued Constitutive Parameters of Metamaterials for Perfect AbsorptionSchematic diagram of a perfect absorber of electromagnetic waves. The media labeled as 0, 1, 2, and 3 are air, metamaterial anti-reflection layer, hydrogenated amorphous silicon (α-Si:H) layer, and Ag substrate, respectively. The thicknesses of the anti-reflection and α-Si:H layers are d 1 and d 2, respectivelyBack to article page