The extra-resonances of metamaterials in terahertz

Some new resonances (extra-resonances) are observed in the simulations of metamaterials in terahertz band. Utilizing the parameter energy balance, the existence of the extra-resonance has been proved. The extra-resonance is found can be affected by the structure of metamaterials and the thickness of the slab. An improved LC model with the consideration of the substrate slab is presented for metamaterials. The causing of the extra-resonances is thought to the self-interaction of the electromagnetic wave, which is produced by the metal structures of the metamaterials and it is the slab that provide the place for this self-interaction. At last the reason why there is no observation of the extra-interaction in the past simulations and experiments is considered to be many of the simulations using a thin slab, as in experiments the exciting sources in the experiments is quite different from the ones in simulations.