Tunable subwavelength focusing with dispersion-engineered metamaterials in the terahertz regime

Jinho Lee; Kwangchil Lee; Haesung Park; Gumin Kang; Dai Hyuk Yu; Kyoungsik Kim

doi:10.1364/OL.35.002254

Tunable subwavelength focusing with dispersion-engineered metamaterials in the terahertz regime

Jinho Lee, Kwangchil Lee, Haesung Park, Gumin Kang, Dai Hyuk Yu, Kyoungsik Kim

Department of Mechanical Engineering

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

19 Citations (Scopus)

Abstract

We develop a terahertz lens with both subwavelength resolution and tunable far-field focal length by extending the surface plasmon (SP) diffraction theory into spoof SPs of slit-groove-structure terahertz metamaterials. The dispersion properties of terahertz groove structures are engineered in the curved depth profile to produce a directional beaming feature and mimic SPs at the same time. The finite-difference time-domain simulation results confirm that the far-field focal position can be tuned by controlling the curvature of the relative electric field phase distribution profile on the output surface.

Original language	English
Pages (from-to)	2254-2256
Number of pages	3
Journal	Optics Letters
Volume	35
Issue number	13
DOIs	https://doi.org/10.1364/OL.35.002254
Publication status	Published - 2010 Jul 1

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics

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10.1364/OL.35.002254

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AU - Lee, Kwangchil

AU - Park, Haesung

AU - Kang, Gumin

AU - Yu, Dai Hyuk

AU - Kim, Kyoungsik

PY - 2010/7/1

Y1 - 2010/7/1

N2 - We develop a terahertz lens with both subwavelength resolution and tunable far-field focal length by extending the surface plasmon (SP) diffraction theory into spoof SPs of slit-groove-structure terahertz metamaterials. The dispersion properties of terahertz groove structures are engineered in the curved depth profile to produce a directional beaming feature and mimic SPs at the same time. The finite-difference time-domain simulation results confirm that the far-field focal position can be tuned by controlling the curvature of the relative electric field phase distribution profile on the output surface.

AB - We develop a terahertz lens with both subwavelength resolution and tunable far-field focal length by extending the surface plasmon (SP) diffraction theory into spoof SPs of slit-groove-structure terahertz metamaterials. The dispersion properties of terahertz groove structures are engineered in the curved depth profile to produce a directional beaming feature and mimic SPs at the same time. The finite-difference time-domain simulation results confirm that the far-field focal position can be tuned by controlling the curvature of the relative electric field phase distribution profile on the output surface.

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Tunable subwavelength focusing with dispersion-engineered metamaterials in the terahertz regime

Abstract

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