Microelectromechanical Maltese-cross metamaterial with tunable terahertz anisotropy

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • W. M. Zhu
  • A. Q. Liu
  • T. Bourouina
  • J. H. Teng
  • X. H. Zhang
  • G. Q. Lo
  • D. L. Kwong
  • N. I. Zheludev

Detail(s)

Original languageEnglish
Article number1274
Journal / PublicationNature Communications
Volume3
Publication statusPublished - 2012
Externally publishedYes

Link(s)

Abstract

Dichroic polarizers and waveplates exploiting anisotropic materials have vast applications in displays and numerous optical components, such as filters, beamsplitters and isolators. Artificial anisotropic media were recently suggested for the realization of negative refraction, cloaking, hyperlenses, and controlling luminescence. However, extending these applications into the terahertz domain is hampered by a lack of natural anisotropic media, while artificial metamaterials offer a strong engineered anisotropic response. Here we demonstrate a terahertz metamaterial with anisotropy tunable from positive to negative values. It is based on the Maltese-cross pattern, where anisotropy is induced by breaking the four-fold symmetry of the cross by displacing one of its beams. The symmetry breaking permits the excitation of a Fano mode active for one of the polarization eigenstates controlled by actuators using microelectromechanical systems. The metamaterial offers new opportunities for the development of terahertz variable waveplates, tunable filters and polarimetry. © 2012 Macmillan Publishers Limited.

Research Area(s)

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Microelectromechanical Maltese-cross metamaterial with tunable terahertz anisotropy. / Zhu, W. M.; Liu, A. Q.; Bourouina, T. et al.
In: Nature Communications, Vol. 3, 1274, 2012.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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