Dimer and polymer metamaterials with alternating electric and magnetic coupling
Diatomic metamaterials, whose properties can be easily tailored, are studied with the aid of split ring resonator elements. Two different types are shown to exist depending on the coupling within a unit cell being larger or smaller than that between the unit cells. The freedom to adjust the coupling...
| Main Authors: | , , , , , , |
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| 格式: | Journal article |
| 語言: | English |
| 出版: |
2011
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| 總結: | Diatomic metamaterials, whose properties can be easily tailored, are studied with the aid of split ring resonator elements. Two different types are shown to exist depending on the coupling within a unit cell being larger or smaller than that between the unit cells. The freedom to adjust the coupling coefficients is used to construct a chain in which coupling alternates between electric and magnetic, between positive and negative. The resulting dispersion characteristics are shown to be radically different from the classical acoustic and optical branches: the upper branch is a forward wave and the lower branch is a backward wave, and even the gap between the two pass bands may disappear yielding infinite phase, finite group-velocity wave. The theory is confirmed both by simulations and experiments. © 2011 American Physical Society. |
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