Abstract
We theoretically investigate the classical analog of electromagnetically induced transparency (EIT)
and electromagnetically induced absorption (EIA) in a planar metamaterial at optical frequency, which
originates from destructive and constructive interference between dark and radiative elements. The
metamaterial consists of two coupled resonators with different geometries. An EIT-like transparent window with
low absorption is observed and found to be strongly affected by resonant states of the resonators. The
transition between the EIT and EIA is achieved by changing the split width and coupling distance. The
absorption is enhanced up to 2.5 times compared with the dipolar case. The excitation of the dark mode is very
important for EIT- and EIA-like responses of the proposed metamaterial. The EIT and EIA phenomena offer a
potential method for manipulating electromagnetic response in metamaterial-based devices.
© 2013 Chinese Optics Letters
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