Quasi-three-dimensional post-array for propagation and focusing of a terahertz spoof surface plasmon polariton

Nozomu Koja, John C. Young, Takehito Suzuki

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


This paper presents a quasi-three-dimensional post-array designed to propagate a terahertz spoof surface plasmon polariton (terahertz spoof SPP) with confinement. A transmission line making use of a terahertz spoof SPP is a promising device in the terahertz wave band, and there are many previous reports of two-dimensional structures. Three-dimensional structures provide sophisticated designs for transmission lines propagating a terahertz spoof SPP. Eigenmode analysis is used to derive a dispersion diagram for one post with boundary conditions extracted from the full model. The propagation frequency of the terahertz spoof SPP increases with lower heights or smaller diameters, and that remains virtually unchanged for post-spacing and thickness of a substrate. The analysis of the full model confirms the confinement of a terahertz spoof SPP vertically on the post-array. The magnitude of the electric field is strong around the top and bottom and weak at approximately one-third height. The terahertz spoof SPP is confined in the space around the post-array as well as a substrate, while it is confined only on substrates in conventional two-dimensional structures. The designed post-array can control the three-dimensional focusing of a terahertz spoof SPP in an arbitrary volume of space.

Original languageEnglish
Pages (from-to)479-485
Number of pages7
JournalApplied Physics A: Materials Science and Processing
Issue number2
StatePublished - Aug 25 2015

Bibliographical note

Funding Information:
The authors wish to thank Mr. Yudai Kishi and Mr. Takahisa Togashi for their kind support to complete this paper. The authors also wish to thank Dr. Keisuke Takano and Prof. Masanori Hangyo for valuable comments during the execution of this study. This research has been supported by a Grant-in-Aid for Young Scientists (A) (No. 26706017) from Japan Society for the Promotion of Science (JSPS) and a Grant-in-Aid for Challenging Exploratory Research (No. 26600108) from the Japan Society for the Promotion of Science (JSPS), and commissioned by the Strategic Information and Communications R&D Promotion Programme (SCOPE) (No. 122103011) from the Ministry of Internal Affairs and Communications.

Publisher Copyright:
© 2015, Springer-Verlag Berlin Heidelberg.

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Science (all)


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