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

Jinho Lee; Kwangchil Lee; Haesung Park; Gumin Kang; Kyoungsik Kim

doi:10.1117/12.861023

10 September 2010 Tunable subwavelength focusing with slit-groove-based metamaterials in THz

Jinho Lee, Kwangchil Lee, Haesung Park, Gumin Kang, Kyoungsik Kim

Proceedings Volume 7754, Metamaterials: Fundamentals and Applications III; 77541I (2010) https://doi.org/10.1117/12.861023
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

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 E_x phase are observed in the simulation and help to comprehend a subwavelength 1D slit-groove-based metamaterials in THz regime.

Citation Download Citation

Jinho Lee, Kwangchil Lee, Haesung Park, Gumin Kang, and Kyoungsik Kim "Tunable subwavelength focusing with slit-groove-based metamaterials in THz", Proc. SPIE 7754, Metamaterials: Fundamentals and Applications III, 77541I (10 September 2010); https://doi.org/10.1117/12.861023

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