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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 13 — Jul. 1, 2010
  • pp: 2254–2256

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

Jinho Lee, Kwangchil Lee, Haesung Park, Gumin Kang, Dai-Hyuk Yu, and Kyoungsik Kim  »View Author Affiliations

Optics Letters, Vol. 35, Issue 13, pp. 2254-2256 (2010)

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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.

© 2010 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(300.6495) Spectroscopy : Spectroscopy, teraherz
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Thin Films

Original Manuscript: February 25, 2010
Revised Manuscript: June 3, 2010
Manuscript Accepted: June 8, 2010
Published: June 29, 2010

Virtual Issues
Vol. 5, Iss. 11 Virtual Journal for Biomedical Optics

Jinho Lee, Kwangchil Lee, Haesung Park, Gumin Kang, Dai-Hyuk Yu, and Kyoungsik Kim, "Tunable subwavelength focusing with dispersion-engineered metamaterials in the terahertz regime," Opt. Lett. 35, 2254-2256 (2010)

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