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Large group delay in a microwave metamaterial analog of electromagnetically induced transparency

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6 Author(s)
Zhang, Lei ; Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA ; Tassin, Philippe ; Koschny, Thomas ; Kurter, C.
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We report on our experimental work concerning a planar metamaterial exhibiting classical electromagnetically induced transparency (EIT). Using a structure with two mirrored split-ring resonators as the dark element and a cut wire as the radiative element, we demonstrate that an EIT-like resonance can be achieved without breaking the symmetry of the structure. The mirror symmetry of the metamaterial’s structural element results in a selection rule inhibiting magnetic dipole radiation for the dark element, and the increased quality factor leads to low absorption (<10%) and large group index (of the order of 30).

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Applied Physics Letters  (Volume:97 ,  Issue: 24 )