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

Details Observation of flat band for terahertz coupled plasmon in metallic kagomé lattice Observation of flat band for terahertz coupled plasmon in metallic kagomé lattice

2012-03-28

arxiv.org/abs/1203.6138v1

Physics

Optics

5pages, 4figures

Scientific paper

We study the dispersion relation of a metamaterial composed of metallic discs and bars arranged to have kagom\'{e} symmetry and find that a plasmonic flat band is formed by the topological nature of the kagom\'{e} 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.

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