Resonant mode coupling in hybrid all-dielectric metamaterial

We present a theoretical study of resonant mode coupling in hybrid all-dielectric metamaterial consisting of inner cylinder and outer hollow cylinder. The resonant mode coupling of these two resonators is comprehensively analyzed by tracking the transmission spectrum variations and electromagnetic field distributions at resonance frequencies. It is found that the electromagnetic properties of the hybrid metamaterial are fully determined by the interaction of the resonant modes. Moreover, we achieve the mechanical tunability of the metamaterial based on the coupling of the magnetic resonances and show that the transmission of our metamaterial can be continuously modulated from −1.51 dB to −21.81 dB. The simulation results are well produced by a coupled oscillator model, providing a valuable insight into the coupling mechanism of our system. (paper)