Observation of flat band for terahertz spoof plasmons in a metallic kagomé lattice
Observation of flat band for terahertz spoof plasmons in a metallic kagomé lattice
We study the dispersion relation of a metamaterial composed of metallic disks and bars arranged to have kagome symmetry and find that a plasmonic flat band is formed by the topological nature of the kagome lattice. To confirm the flat-band formation, we fabricate the metamaterial and make transmission measurements in …