title: Negative index of refraction in metallic metamaterial comprising split-ring resonators.
abstract: We numerically investigate the negative index of refraction in a metamaterial composed of metallic split-ring resonators, which exhibits simultaneously negative permittivity and permeability without resorting to additional metallic wires. It is confirmed that, in the left-handed band, negative permittivity is generated in analogy to the cut-wire metamaterial and negative permeability comes from the antisymmetric resonant mode, which occurs at a frequency band about 3 times higher than the fundamental magnetic resonance proposed by Pendry [IEEE Trans. Microwave Theory Tech. 47, 2075 (1999)].
authors.affiliation: Physics Department, Southeast University, Nanjing 211189, People's Republic of China. zgdong@seu.edu.cn
authors.forename: Zheng-Gao
authors.initials: ZG
authors.lastname: Dong
authors.forename: Shuang-Ying
authors.initials: SY
authors.lastname: Lei
authors.forename: Ming-Xiang
authors.initials: MX
authors.lastname: Xu
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Fu-Ming
authors.initials: FM
authors.lastname: Wang
authors.forename: Shi-Ning
authors.initials: SN
authors.lastname: Zhu