Microelectromechanical Maltese-cross metamaterial with tunable terahertz anisotropy

W.M. Zhu, A.Q. Liu (), T. Bourouina, D.P. Tsai, J.H. Teng, X.H. Zhang, G.Q. Lo, D.L. Kwong and N.I. Zheludev
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W.M. Zhu: School of Electrical and Electronic Engineering, Nanyang Technological University
A.Q. Liu: School of Electrical and Electronic Engineering, Nanyang Technological University
T. Bourouina: School of Electrical and Electronic Engineering, ESIEE Université Paris-Est
D.P. Tsai: Research Center for Applied Sciences, Academia Sinica
J.H. Teng: Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore
X.H. Zhang: Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore
G.Q. Lo: Institute of Microelectronics, 11 Science Park Road, Singapore 117685, Singapore
D.L. Kwong: Institute of Microelectronics, 11 Science Park Road, Singapore 117685, Singapore
N.I. Zheludev: Optoelectronics Research Centre

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: 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.

Date: 2012
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DOI: 10.1038/ncomms2285

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