Zhang Yong-Liang, Jin Wei, Dong Xian-Zi, Zhao Zhen-Sheng, Duan Xuan-Ming
Laboratory of Organic NanoPhotonics and Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China.
Opt Express. 2012 May 7;20(10):10776-87. doi: 10.1364/OE.20.010776.
We investigate the optical properties of mono- and double-layer asymmetric fishnet metamaterials with orientated elliptical holes, which exhibit exotic spectral and polarization rotating characteristics in the visible spectral range. Our results show that nontrivial orientations of the holes with respect to the reciprocal lattice vectors of the periodic lattice in both systems produce strong polarization rotation as well as additional enhanced optical transmission peaks. Analysis of the electromagnetic field distribution shows the unusual effect is produced by the spinning localized surface plasmon resonances due to the asymmetric geometry. High sensitivity of the hybridized mode on the dielectric spacing, the aspect ratio of the holes and the embedding media in double-layer structure is also observed. The dependence of spectral and polarization response on the orientation of the holes and the embedding media is useful for design of chiral metamaterials at optical frequencies and tailoring the polarization behavior of the metallic nano-structures.
我们研究了具有定向椭圆孔的单层和双层非对称渔网超材料的光学特性，这些超材料在可见光谱范围内展现出奇异的光谱和偏振旋转特性。我们的结果表明，在这两种系统中，孔相对于周期性晶格的倒易晶格矢量的非平凡取向会产生强烈的偏振旋转以及额外增强的光透射峰。对电磁场分布的分析表明，这种异常效应是由不对称几何结构导致的自旋局域表面等离子体共振产生的。还观察到双层结构中杂化模式对介电间距、孔的纵横比和嵌入介质具有高灵敏度。光谱和偏振响应与孔的取向以及嵌入介质的相关性，对于光学频率下手性超材料的设计以及调整金属纳米结构的偏振行为很有用。
