Mode Evolution and Transmission Suppression in a Perforated Ultrathin Metallic Film with a Triangular Array of Holes
Mode Evolution and Transmission Suppression in a Perforated Ultrathin Metallic Film with a Triangular Array of Holes
复制标题
具有三角形孔阵列的穿孔超薄金属薄膜中的模式演化和传输抑制
DOI：
10.1007/s11468-011-9321-5
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发表时间：
2012-09-01
期刊：
影响因子：
3
通讯作者：
Jin, Chongjun
中科院分区：
文献类型：
--
作者：
Liu, Mingkai;Song, Yanjun;Jin, Chongjun
本文从理论上研究了周期性三角形孔阵穿孔金属薄膜中谐振模的演化和透射抑制效应。研究发现，不同谐振频率的性质随空穴半径的增大而变化，并且可以从电场分布而非Fano模型定性地解释谐振频率的非单调移动。此外，我们还分析了双折射光纤中的强模相互作用现象。当空穴直径接近晶格常数的五分之四时，偶极共振和十极共振之间的耦合可以导致正方晶格的光子晶体光纤中不存在的反交叉和大的拉比分裂，由此产生的混合模可以归因于偶极共振和十极共振之间的准同相和准反相干涉。通过比较不同谐振腔在不同空穴半径下的TS效应，我们得出结论：虽然偶极共振、短程表面等离子体激元和混合模式都可以对TS效应产生贡献，但我们结构中突出的TS效应主要是由结构的集体偶极共振引起的。这些研究结果可能是感兴趣的未来的研究，在基于的结构和设备。
We theoretically study the evolution of the resonant modes and the transmission suppression (TS) effect in a perforated ultrathin metallic film (PUMF) with a periodic triangular array of holes. It is found that the properties of different resonances change as the hole radius increases, and the non-monotonic shift of resonant frequency can be interpreted qualitatively from the electric field distribution other than the Fano model. In addition, we analyze the strong mode interaction phenomenon in PUMF. When the diameter of holes approaches to four fifths of the lattice constant, the coupling between dipolar resonance and decapolar resonance can lead to an anticrossing and a large Rabi splitting, which is not available in PUMFs with square lattice; the resulting hybrid modes can be ascribed to the quasi-inphase and quasi-antiphase interferences between dipolar resonance and decapolar resonance. By comparing the TS effect of different resonances under different hole radii, we conclude that although dipolar resonance, short-range surface plasmons, and hybrid modes can all contribute to TS effect; the prominent TS effect in our structure should be mainly caused by the collective dipolar resonance of the structure. These findings might be of interest for the future studies in PUMF-based structures and devices.