超材料
反对称关系
激发态
激发
太赫兹辐射
吸收(声学)
斗篷
图层(电子)
凝聚态物理
物理
材料科学
光电子学
分子物理学
光学
原子物理学
纳米技术
量子力学
数学物理
作者
Wei Tan,Caihong Zhang,Chun Li,Xiaoying Zhou,Xiaoqing Jia,Feng Zheng,Juan Su,Biaobing Jin
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.
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