摘要
Whether an artificially designed negative-index structure could be regarded as a homogeneous medium or not rests with the ratio of its structural unit (man-made atom) over the operation wavelength. However, this definition is ambiguous, and usually the ratio is too large to rigorously meet the effective medium theory. In this paper a three-dimensional (3D) isotropic structure is presented which is obtained from a two-dimensional (2D) isotropic structure rotating on its axis for a circle, and the material is silver. Numerical studies confirm that both the 2D and 3D structures can realize a negative refractive index at microwave wavelengths. Observing the monitored surface current distributions and analogizing the molecular current and the magnetic domain, we suggest a new concept of domain-structure to explain the interior structure of this metamaterial, and finally conclude that the 3D structure is a kind of domain-structured and isotropic metamaterial.
源语言 | 英语 |
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页(从-至) | 1034-1037 |
页数 | 4 |
期刊 | Physica B: Condensed Matter |
卷 | 407 |
期 | 6 |
DOI | |
出版状态 | 已出版 - 15 3月 2012 |