Metamaterials are artificial media composed of periodic/aperiodic subwavelength metal/dielectric structures (i.e., meta-atom). This class of media possess electromagnetic properties not present in the constituent materials and have yielded breakthrough electromagnetic phenomena. The capability of tailoring effective electric permittivity and magnetic permeability responses leads to a wide range of accomplishments, such as enhanced nonlinearity, [1] and electromagnetic cloak. [2] However, high losses, strong