Terahertz path-length lens composed of oblique metal slit array

Takahisa Togashi, Hideaki Kitahara, Keisuke Takano, Masanori Hangyo, Mamoru Mita, John C. Young, Takehito Suzuki

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Need for high-performance and sophisticated optical devices in the terahertz wave band is growing rapidly with terahertz technological progress. This paper presents a lens in the terahertz wave band based on phase control using an oblique metal slit array. A convex oblique slit array can produce a focusing effect. This focusing effect is confirmed by full-wave analysis for the designed terahertz path-length lens. The effective refractive index computed from the full-wave analysis is consistent with analytical expressions and changes from 1.00 to 1.56 with the angle of the metal slit array. Full-wave analysis also confirms that the lamination errors of the path-length lens have limited influence on the focusing effects. The robustness of the lens design is essential for its industrial applications to terahertz optical devices.

Original languageEnglish
Pages (from-to)397-402
Number of pages6
JournalApplied Physics A: Materials Science and Processing
Issue number2
StatePublished - Feb 2014

Bibliographical note

Funding Information:
This research has been partially commissioned by a Strategic Information and Communications R&D Promotion Programme (SCOPE) (No. 122103011) from the Ministry of Internal Affairs and Communications, and 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 Japan Society for the Promotion of Science (JSPS).

Publisher Copyright:
© 2014, Springer-Verlag Berlin Heidelberg.

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Science (all)


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