Observation of flat band for terahertz spoof plasmon in metallic kagomé lattice

Abstract

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 the terahertz regime. Two bands formed by transmission minima that depend on the polarization of the incident terahertz beams are observed. One of the bands corresponds to the flat band, as confirmed by the fact that the resonant frequency is almost independent of the incident angle.

5pages, 5figures

References in corpus (4)

• Flat bands and Wigner crystallization in the honeycomb optical lattice
• Bose condensation in flat bands
• Extraordinary Optical Transmission Induced by Excitation of a Magnetic Plasmon Propagation Mode in a Diatomic Chain of Slit-hole Resonators
• Electromagnetic response of a metamaterial with field-gradient-induced transparency

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