Figure 8From: Topological insulator metamaterials with tunable negative refractive index in the optical regionDispersion relation of the structure. Representation of the dispersion relation of the Au-Bi2Se3-Au trilayer (left) and the transmittance of the multilayer metamaterials (right) for both (a) trigonal Bi2Se3 and (b) orthorhombic Bi2Se3.Back to article page