Optical Mobius Symmetry in Metamaterials
Optical Mobius Symmetry in Metamaterials
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DOI：
10.1103/physrevlett.105.235501
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发表时间：
2010-12-02
影响因子：
8.6
通讯作者：
Zhang, Xiang
中科院分区：
文献类型：
--
作者：
Chang, Chih-Wei;Liu, Ming;Zhang, Xiang
我们在实验上观察到光学复合材料中一种新的拓扑对称性，即超材料。虽然在自然材料中还没有发现这种对称性，但在超材料中发现的电磁Mobius对称性相当于Mobius条的结构对称性，扭曲的数量由准原子之间电磁耦合的符号变化控制。我们进一步证明了具有不同耦合符号的超材料表现出的共振频率只取决于“扭曲”的数目而不是位置，从而证实了它的拓扑性质。在超材料中发现的新的拓扑对称性可能使光学材料具有独特的功能。
We experimentally observed a new topological symmetry in optical composites, namely, metamaterials. While it is not found yet in nature materials, the electromagnetic Mobius symmetry discovered in metamaterials is equivalent to the structural symmetry of a Mobius strip, with the number of twists controlled by the sign change of the electromagnetic coupling between the meta-atoms. We further demonstrate that metamaterials with different coupling signs exhibit resonance frequencies that depend only on the number but not the locations of the "twists," thus confirming its topological nature. The new topological symmetry found in metamaterials may enable unique functionalities in optical materials.