Defect-Induced Fano Resonances in Corrugated Plasmonic Metamaterials
Defect-Induced Fano Resonances in Corrugated Plasmonic Metamaterials
复制标题
波纹等离子体超材料中缺陷引起的法诺共振
DOI：
10.1002/adom.201600960
复制
发表时间：
2017-04-18
影响因子：
9
通讯作者：
Zhang, Weili
中科院分区：
文献类型：
--
作者：
Chen, Lin;Xu, Ningning;Zhang, Weili
提出了一种新型缺陷诱导平面元原子，可在有缺陷的波纹金属盘（CMD）结构中支持多个 Fano 共振。数值和实验结果表明，当通过引入小角度缺陷破坏 CMD 的对称性时，可以在太赫兹频率下激发多个 Fano 共振。这些多重法诺共振是由楔形切片边缘引起的亮偶极模式与暗多极欺骗局域表面等离子体模式之间的相互耦合产生的。此外，还研究了缺陷角度对Q因子和四极共振峰共振强度的影响。由于较高的 Fano 共振强度和 Q 因子，可以获得较大的品质因数。 CMD 结构中两个有缺陷切片的结果验证了所观察到的现象的机制。这项工作的发现将为生物传感、太赫兹域过滤和强光与物质相互作用提供缺陷诱导的 Fano 共振平台。
A novel defect-induced planar meta-atom that supports multiple Fano resonances in a defective corrugated metallic disk (CMD) structure is proposed. Numerical and experimental results reveal that multiple Fano resonances can be excited at terahertz frequencies when the symmetry of the CMD is broken by introducing a small angular defect. These multiple Fano resonances result from mutual coupling between the bright dipolar mode evoked by the edge of the wedge-shaped slice and dark multipole spoof localized surface plasmon modes. Furthermore, the influence of the angle of defect on the Q-factor and the resonance intensity of the quadrupolar resonance peak is investigated. Large values of figure of merit are obtained due to higher Fano resonance intensity and Q-factor. Results from two defective slices in the CMD structure validate the mechanism of the observed phenomenon. The findings of this work would enable a defect-induced Fano resonance platform for biosensing, terahertz domain filtering, and strong light-matter interactions.