Broadband negative permeability using hybridized metamaterials: Characterization, multiple hybridization, and terahertz response

Abstract

There is an increased interest to create artificial magnetic metamaterials that show a negative permeability over a wide frequency range. In this paper, we experimentally and numerically demonstrate a broadband negative permeability using symmetric cut-wire-pair metamaterial structures. This finding is based on the second-order hybridization, which is activated by manipulating the correlation between the coupling within a single cut-wire pair and the coupling between neighboring cut-wire pairs. An effective medium analysis is performed to identify the role of the internal and external interactions in the hybridized metamaterials. An extended second-order hybridization scheme is proposed, which describes the electromagnetic response of more complex systems that exhibit an extremely wide band of negative permeability. In addition, the terahertz response of the cut-wire-pair dimer is further explored by scaling down the dimensions of the structures.