Achieving all-dielectric left-handed metamaterials via single-sized dielectric resonators

We demonstrate that using single-sized dielectric resonators, all-dielectric left-handed metamaterial (LHM) can be achieved in the C-band microwave regime. The single-sized rectangular resonator, operating under higher-order resonant modes, possesses electric and magnetic responses simultaneously, leading to the double-negative resonance behavior. We find that the electric/magnetic resonance can be enhanced by elongating the size of the rectangular resonators along the electric field direction. It is shown that polarization currents in dielectric resonators are the same as conduction currents in cut-wire pairs. Experiments were carried out to verify the designed all-dielectric LHM. The proposed method provides a convenient route to all-dielectric LHMs. (C) 2012 American Institute of Physics. [doi:10.1063/1.3686200]