Observation of a nonradiative flat band for spoof surface plasmons in a metallic Lieb lattice

Abstract

We demonstrate a nonradiative flat band for spoof surface plasmon polaritons bounded on a structured surface with Lieb lattice symmetry in the terahertz regime. First, we theoretically derive the dispersion relation of spoof plasmons in a metallic Lieb lattice based on the electrical circuit model. We obtain three bands, one of which is independent of wave vector. To confirm the theoretical result, we numerically and experimentally observe the flat band in transmission and attenuated total reflection configurations. We reveal that the quality factor of the nonradiative flat-band mode decoupled from the propagating wave is higher than that of the radiative flat-band mode. This indicates that the nonradiative flat-band mode is three-dimensionally confined in the lattice.

arXiv comment7 pages, 7 figures

References in corpus (7)

• Terahertz surface plasmon polariton propagation and focusing on periodically corrugated metal wires
• Observation of a localized flat-band state in a photonic Lieb lattice
• Observation of bound states in Lieb photonic lattices
• Observation of flat band for terahertz spoof plasmon in metallic kagomé lattice
• Resonant guided wave networks
• Tight-binding photonic bands in metallophotonic waveguide networks and flat bands in kagome lattices
• Suppression of narrow-band transparency in a metasurface induced by a strongly enhanced electric field

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