Abstract
An asymmetric metamaterial exhibiting an analog of double electromagnetically induced
transparency (EIT) in the middle-infrared region is reported. The metamaterial consists of
two-layered arrays of U-shaped rings embedded in a medium, with the lower layer rotated by 90°. Our
simulations demonstrate that both maximum group indexes are extremely high at the two EIT-like
positions. The group index reaches about thrice the currently reported maximum value at the
high-frequency EIT-like position. The transmittance at the two transparency positions also possesses
extremely high <i>Q</i> factors, which is conducive to controlling the propagation of electromagnetic
waves.
© 2013 Chinese Optics Letters
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