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Terahertz path-length lens composed of oblique metal slit array

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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.

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Acknowledgments

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).

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Authors and Affiliations

  1. Department of Electrical and Electronic Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki, 316-8511, Japan

    Takahisa Togashi & Takehito Suzuki

  2. Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan

    Hideaki Kitahara, Keisuke Takano & Masanori Hangyo

  3. M&M Research Laboratory, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki, 316-8511, Japan

    Mamoru Mita

  4. Electrical and Computer Engineering, University of Kentucky, Lexington, KY, 40506-0046, USA

    John C. Young

Authors
  1. Takahisa Togashi
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  2. Hideaki Kitahara
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  3. Keisuke Takano
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  4. Masanori Hangyo
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  5. Mamoru Mita
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  6. John C. Young
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  7. Takehito Suzuki
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Correspondence to Takehito Suzuki.

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Togashi, T., Kitahara, H., Takano, K. et al. Terahertz path-length lens composed of oblique metal slit array. Appl. Phys. A 118, 397–402 (2015). https://doi.org/10.1007/s00339-014-8918-x

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  • DOI: https://doi.org/10.1007/s00339-014-8918-x

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