Quasicrystalline Metamaterials

The authors measure and analyze the optical properties of 2-dimensional quasicrystalline metamaterials. The structure comprises a cut-plate structure on a 180 nm thick HfO₂ slab waveguide. The cut plates consist of two 25 nm thick gold dots with 120 nm diameter, separated by 50 nm of MgF₂ spacer. These basic unit cells are arranged in a Penrose-type 2D arrangement with tiling constant 530 nm. Hence the structure shows a more photonic-crystal like behaviour. The optical properties are determined by the individual elements and by the 2D arrangement and the waveguide.