Three Dimensional Optical Metamaterial Exhibiting Negative Refractive Index

Figure S1. The refractive index of the fishnet metamaterials for different numbers of layers and material loss. (a) The refractive index for different number of functional layers along the propagation direction. One important feature of metamaterials is the consistent refractive index profiles for different thicknesses. The effective refractive index was found by calculating the complex transmittance and reflectance and solving for the Fresnel equation: