Propagation of low-frequency spoof surface plasmon polaritons in a bilateral cross-metal diaphragm channel waveguide in the absence of bandgap

Jin Jei Wu, Chien-Jang Wu, Da Jun Hou, Kexin Liu, Tzong Jer Yang

Research output: Contribution to journalArticle

15 Citations (Scopus)


In this work, spoof surface plasmon polaritons in a novel subwavelength periodic bilateral cross-metal diaphragm channel waveguide are theoretically and experimentally investigated. It is found that the propagation frequency range can be broadened due to the absence of the bandgap between the fundamental band and the second guiding band by tuning the geometric parameters. In addition, the dispersion curve of the second band can pass through the light line and then enter into the radiation region, leading to a frequency-based beam steering radiation. We also find that, below the light line, there exists an anomalous linear dispersion such that the guiding mode propagation length can be extended up to around 200\lambda. Good agreement has been achieved between experimental and numerical results.

Original languageEnglish
Article number7009982
JournalIEEE Photonics Journal
Issue number1
Publication statusPublished - 2015 Feb 1



  • Bandgap
  • channel waveguides
  • sproof surface plasmon polaritons

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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