Abstract
A switchable THz absorber, with absorbance more than 90% is proposed, and numerically characterized. The absorber structure is based on metamaterials with unit cells consisting of two patterned graphene layers separated by a 5-nm thick layer of Al 2 O 3 . Numerical results show that when the chemical potential of the top graphene microribbons are tuned by an external variable bias and that of the lower graphene fishnet is kept at μ C =0, frequency of the absorption peaks can be tuned as desired, therefore we can have tunable or switchable absorbers.
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