Actively Controlling the Topological Transition of Dispersion Based on Electrically Controllable Metamaterials
Actively Controlling the Topological Transition of Dispersion Based on Electrically Controllable Metamaterials
复制标题
基于电控超材料主动控制色散拓扑转变
DOI：
10.3390/app8040596
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发表时间：
2018-04-01
影响因子：
2.7
通讯作者：
Chen, Hong
中科院分区：
文献类型：
--
作者：
Guo, Zhiwei;Jiang, Haitao;Chen, Hong
Topological transition of the iso-frequency contour (IFC) from a closed ellipsoid to an open hyperboloid, will provide unique capabilities for controlling the propagation of light. However, the ability to actively tune these effects remains elusive and the related experimental observations are highly desirable. Here, tunable electric IFC in periodic structure which is composed of graphene/dielectric multilayers is investigated by tuning the chemical potential of graphene layer. Specially, we present the actively controlled transportation in two kinds of anisotropic zero-index media containing PEC/PMC impurities. At last, by adding variable capacitance diodes into two-dimensional transmission-line system, we present the experimental demonstration of the actively controlled magnetic topological transition of dispersion based on electrically controllable metamaterials. With the increase of voltage, we measure the different emission patterns from a point source inside the structure and observe the phase-transition process of IFCs. The realization of actively tuned topological transition will opens up a new avenue in the dynamical control of metamaterials.
