Li Zhaofeng, Caglayan Humeyra, Colak Evrim, Zhou Jiangfeng, Soukoulis Costas M, Ozbay Ekmel
Nanotechnology Research Center, and Department of Physics, Bilkent University, Bilkent, 06800 Ankara, Turkey.
Opt Express. 2010 Mar 15;18(6):5375-83. doi: 10.1364/OE.18.005375.
A pair of mutually twisted metallic cross-wires can produce giant optical activity. When this single chiral layer is stacked layer by layer in order to build a thick chiral metamaterial, strong coupling effects are found between the two adjacent chiral layers. We studied these coupling effects numerically and experimentally. The results show that the existing coupling between chiral layers can make the chiral properties of a two-layered chiral metamaterial different from the constituting single chiral layers. It is explained qualitatively that the coupling effects are generated from the coupling of metallic cross-wires belonging to different chiral layers. Our experimental results are in good agreement with the simulation results.
一对相互缠绕的金属交叉线可产生巨大的光学活性。当将这个单一的手性层逐层堆叠以构建一个厚的手性超材料时，发现两个相邻手性层之间存在强耦合效应。我们通过数值和实验研究了这些耦合效应。结果表明，手性层之间现有的耦合可使双层手性超材料的手性特性不同于构成它的单个手性层。定性地解释了耦合效应是由属于不同手性层的金属交叉线的耦合产生的。我们的实验结果与模拟结果吻合良好。
