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Opt Express. 2009 Oct 26;17(22):20307-12. doi: 10.1364/OE.17.020307.

A close-ring pair terahertz metamaterial resonating at normal incidence.

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  • 1School of electrical and computer Engineering, Oklahoma State University, Oklahoma 74078, USA.


We present a systematic study of a close-ring pair based freestanding metamaterial fabricated by double-layer, self-aligned photolithography. Terahertz time-domain spectroscopy transmission measurements and numerical simulations have revealed negative index of refraction in the frequency range of 0.66-0.90 THz under normal wave incidence. The observed resonance behaviors can be well explained by a theoretical circuit model. The electromagnetic properties and the figure of merit of such close-ring metamaterials are also explored in terms of geometrical parameters of the unit cell with a goal of providing optimized design for three-dimensional metamaterials and potential device applications.

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