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. 2016 Apr 13;7:11329. doi: 10.1038/ncomms11329

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(a) Sketch of the structure. Thicknesses of MgF₂ and Au layers are 45 and 30 nm, respectively. Thickness of Si₃N₄ membrane is 50 nm. Lattice period is 750 × 750 nm. Size of holes is 260 × 530 nm. (b) Experimentally measured transmission spectrum of the fishnet metamaterial. Inset shows a scanning electron microscopy image of the fabricated structure. (c) Effective refractive index of the fishnet metamaterial extracted for the normal incidence. The marked lines in b and c represent the wavelengths in the regions of elliptic dispersion (red), crossover optical topological transition (green) and hyperbolic dispersion (blue).