摘要
Negative-index refraction is demonstrated in a lamellar composite with epsilon-negative （ENG） and mu-negative （MNG） materials stacked alternatively. Based on the effective medium approximation, simultaneously negative effective permittivity and permeability of such a lamellar composite are obtained theoretically and further proven by full-wave simulations. Consequently, the renowned left-handed metamaterial comprising split ring resonators and wires is interpreted as an analogy of such ENG-MNG layers. In addition, beyond the effective medium approximation, the propagating field squeezed near the ENG/MNG interface is demonstrated to be left-handed surface waves with backward phase velocity.
Negative-index refraction is demonstrated in a lamellar composite with epsilon-negative （ENG） and mu-negative （MNG） materials stacked alternatively. Based on the effective medium approximation, simultaneously negative effective permittivity and permeability of such a lamellar composite are obtained theoretically and further proven by full-wave simulations. Consequently, the renowned left-handed metamaterial comprising split ring resonators and wires is interpreted as an analogy of such ENG-MNG layers. In addition, beyond the effective medium approximation, the propagating field squeezed near the ENG/MNG interface is demonstrated to be left-handed surface waves with backward phase velocity.
基金
Project supported by the State Key Program for Basic Research of China （Grant No 2004CB619003）, and by the National Natural Science Foundation of China （Grant No 90201008）.
