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Opt Lett. 2012 Aug 15;37(16):3366-8. doi: 10.1364/OL.37.003366.

Low-loss ultra-high-Q dark mode plasmonic Fano metamaterials.

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  • 1School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA.


We experimentally demonstrate a planar terahertz Fano metamaterial with an ultrahigh quality (Q) factor of 227. This is achieved by the excitation of the nonradiative dark modes by introducing a tiny asymmetry in the metamaterial structure. The extremely sharp quadrupole and Fano resonances are excited at normal incidence for orthogonal polarizations of the electric field. In order to capture the narrow linewidth of the dark resonance modes, we perform high resolution terahertz time-domain measurements with a scan length of 200 picoseconds and frequency resolution of 5 GHz. These high-Q metamaterials can be used in ultrasensitive label-free terahertz sensing, dense photonic integration, and narrowband filtering.

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