Magnetic graphene metamaterial

Graphene has emerged as a novel plasmonic material with advantageous properties for metamaterial design, such as highly confined plasmons and fast electrical tuning by carrier injection. Here, strong magnetic dipole response by graphene split nanorings at THz frequencies are predicted, allowing to achieve metamaterials with a high degree of field confinement (~one hundredth of the excitation wavelength) that is not attainable by using thin layers of conventional noble metals. An approach based on finite element simulations and analytical calculations is used to show that graphene split-ring resonators (GSRRs) of nanoscale dimensions can be used to produce strong magnetic response in the THz regime.