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We investigated numerically the electromagnetically induced transparency(EIT) behavior with the maximum Q factor is up to 28000 in a metal-dielectricmetamaterial. It composed of two layers, a metallic strip as bright modestacked above a dielectric rod as another bright mode. The coherent couplingbetween the broad electric dipole induced by the metal strip and the narrowtoroidal dipole induced by the dielectric rod leads to the destructiveinterference, then introduces a transparency window. Interestingly, the EITwindow could be effectively influenced by varying parameters of the two layersand the thickness of middle spacer. This process can be explained by usingtwo-particle model. Furthermore, the radiation loss is greatly suppressedwithin the EIT windows and the slow light effect is improved a lot. Theseexcellent properties also provide an effective platform for the filters andsensitive chemical and biological sensors in the optical range.

Analogue of electromagnetically induced transparency with high Q factor in Metal-dielectric metamaterials