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

doi:10.1007/s00339-014-8918-x

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

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

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 language	English
Pages (from-to)	397-402
Number of pages	6
Journal	Applied Physics A: Materials Science and Processing
Volume	118
Issue number	2
DOIs	https://doi.org/10.1007/s00339-014-8918-x
State	Published - 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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10.1007/s00339-014-8918-x

Cite this

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title = "Terahertz path-length lens composed of oblique metal slit array",

abstract = "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.",

author = "Takahisa Togashi and Hideaki Kitahara and Keisuke Takano and Masanori Hangyo and Mamoru Mita and Young, {John C.} and Takehito Suzuki",

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AU - Kitahara, Hideaki

AU - Takano, Keisuke

AU - Hangyo, Masanori

AU - Mita, Mamoru

AU - Young, John C.

AU - Suzuki, Takehito

N1 - 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.

PY - 2014/2

Y1 - 2014/2

N2 - 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.

AB - 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.

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Terahertz path-length lens composed of oblique metal slit array

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