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Proceedings Paper

Tunable subwavelength focusing with slit-groove-based metamaterials in THz
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Paper Abstract

We design the THz lens made of slit-groove-based metamaterials with tunable far-field focal length as well as subwavelength resolution, based on surface plasmons(SP) diffraction theory into spoof SP of THz region. In THz regime, the curved depth profile of grooves from both sides of metal slit produce directional beaming and mimic SP at the same time. By arranging the depth of grooves in traced profile, it is possible to optimize the focal position in THz region without changing the size of structure. It is performed numerical simulation of a designed structure through finite-difference time-domain (FDTD) method and shows the subwavelength imaging of the designed position. In addition, the change of focal length and the relative Ex phase are observed in the simulation and help to comprehend a subwavelength 1D slit-groove-based metamaterials in THz regime.

Paper Details

Date Published: 10 September 2010
PDF: 6 pages
Proc. SPIE 7754, Metamaterials: Fundamentals and Applications III, 77541I (10 September 2010); doi: 10.1117/12.861023
Show Author Affiliations
Jinho Lee, Yonsei Univ. (Korea, Republic of)
Kwangchil Lee, Yonsei Univ. (Korea, Republic of)
Haesung Park, Yonsei Univ. (Korea, Republic of)
Gumin Kang, Yonsei Univ. (Korea, Republic of)
Kyoungsik Kim, Yonsei Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7754:
Metamaterials: Fundamentals and Applications III
Allan D. Boardman; Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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