Electrically controllable fishnet metamaterial based on nematic liquid crystal.
Electrically controllable fishnet metamaterial based on nematic liquid crystal.
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DOI：
10.1364/oe.19.001563
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发表时间：
2011-01
期刊：
影响因子：
3.8
通讯作者：
Fuli Zhang;Weihong Zhang;Qian Zhao;Jingbo Sun;K. Qiu;Ji Zhou;D. Lippens
中科院分区：
文献类型：
--
作者：
Fuli Zhang;Weihong Zhang;Qian Zhao;Jingbo Sun;K. Qiu;Ji Zhou;D. Lippens
在微波频率下，通过将向列相液晶嵌入鱼网网层的空隙中，实现了一种变折射率超材料。在外加电场的作用下，左手通带可以可逆地从9.14 GHz移动到8.80 GHz，而右上通带几乎不变。结果表明，在LC分子重取向过程中，由于渔网网层间介电常数的增加，导致磁共振向低频率移动，导致负折射率区的有效折射率变化为1.1。
A variable index metamaterial is demonstrated by embedding nematic liquid crystal inside fishnet layers' void at microwave frequencies. With an external electric field, the left handed passband can be reversibly shifted from 9.14 to 8.80 GHz, whereas the upper right handed passband is nearly unchanged. It is shown that during LC molecular reorientation, magnetic resonance is shifted to a lower frequency because of the permittivity increase between fishnet layers, leading to an effective index change of 1.1 within negative index regime.