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We theoretically and numerically investigate metamaterials composed ofcoupled resonators with indirect coupling. First, we theoretically analyze amechanical model of coupled resonators with indirect coupling. The theoreticalanalysis shows that an electromagnetically induced transparency (EIT)-likephenomenon with a transparency bandwidth narrower than the resonance linewidthsof the constitutive resonators can occur in the metamaterial with strongindirect coupling. We then numerically examine the characteristics of themetamaterial composed of coupled cut-wire pairs using a finite-differencetime-domain (FDTD) method. The FDTD simulation confirms that an EIT-liketransparency phenomenon occurs in the metamaterial owing to indirect coupling.Finally, we compare the results of the theoretical and numerical analyses. Thebehavior of the EIT-like metamaterial is found to be well described by themechanical model of the coupled resonators.

Electromagnetically induced transparency like transmission in a metamaterial composed of cut-wire pairs with indirect coupling