Observation of flat band for terahertz spoof plasmons in a metallic kagomé lattice

Yosuke Nakata, Takanori Okada, Toshihiro Nakanishi, and Masao Kitano
Phys. Rev. B 85, 205128 – Published 16 May 2012

Abstract

We study the dispersion relation of a metamaterial composed of metallic disks and bars arranged to have kagomé symmetry and find that a plasmonic flat band is formed by the topological nature of the kagomé 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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  • Received 14 March 2012

DOI:https://doi.org/10.1103/PhysRevB.85.205128

©2012 American Physical Society

Authors & Affiliations

Yosuke Nakata1,*, Takanori Okada2, Toshihiro Nakanishi1, and Masao Kitano1,†

  • 1Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
  • 2Pioneering Research Unit for Next Generation, Kyoto University, Kyoto 611-0011, Japan

  • *nakata@giga.kuee.kyoto-u.ac.jp
  • kitano@kuee.kyoto-u.ac.jp

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Vol. 85, Iss. 20 — 15 May 2012

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