Selective coherent perfect absorption of subradiant mode in ultrathin bi-layer metamaterials via antisymmetric excitation

被引:16
|
作者
Tan, Wei [1 ]
Zhang, Caihong [2 ]
Li, Chun [2 ]
Zhou, Xiaoying [2 ]
Jia, Xiaoqing [2 ]
Feng, Zheng [1 ]
Su, Juan [1 ]
Jin, Biaobing [2 ]
机构
[1] China Acad Engn Phys, Microsyst & Terahertz Res Ctr, Chengdu 610299, Peoples R China
[2] Nanjing Univ, Sch Elect Sci & Engn, RISE, Nanjing 210093, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
GRAPHENE; TRANSPARENCY;
D O I
10.1063/1.4983087
中图分类号
O59 [应用物理学];
学科分类号
摘要
We demonstrate that the subradiant mode in ultrathin bi-layer metamaterials can be exclusively excited under two-antisymmetric-beam illumination (or equivalently, at a node of the standing wave field), while the superradiant mode is fully suppressed due to their different mode symmetry. Coherent perfect absorption (CPA) with the Lorentzian lineshape can be achieved corresponding to the subradiant mode. A theoretical model is established to distinguish the different behaviors of these two modes and to elucidate the CPA condition. Terahertz ultrathin bi-layer metamaterials on flexible polyimide substrates are fabricated and tested, exhibiting excellent agreement with theoretical predictions. This work provides physical insight into how to selectively excite the antisymmetric subradiant mode via coherence incidence.
引用
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页数:5
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