Li Guozhou, Li Qiang, Yang Lizhen, Wu Lijun
Opt Lett. 2016 Jul 1;41(13):2911-4. doi: 10.1364/OL.41.002911.
We investigate optical magnetism and optical activity in a simple planar metamolecule composed of double U-shaped metal split ring resonators (SRRs) twisted by 90° with respect to one another. Compared to a single SRR, the resonant energy levels are split and strong magnetic response can be observed due to inductive and conductive coupling. More interestingly, the nonchiral structures exhibit strong optical gyrotropy (1100°/λ) under oblique incidence, benefiting from the strong electromagnetic coupling. A chiral molecule model is proposed to shed light on the physical origin of optical activity. These artificial chiral metamaterials could be utilized to control the polarization of light and promise applications in enantiomer sensing-based medicine, biology, and drug development.
我们研究了一种简单的平面超分子中的光学磁性和光学活性，该超分子由两个相互扭曲90°的U形金属裂环谐振器（SRR）组成。与单个SRR相比，由于电感耦合和传导耦合，共振能级发生分裂，并且可以观察到强烈的磁响应。更有趣的是，这种非手性结构在斜入射下表现出强烈的光学旋光性（1100°/λ），这得益于强电磁耦合。我们提出了一个手性分子模型来揭示光学活性的物理起源。这些人工手性超材料可用于控制光的偏振，并有望应用于基于对映体传感的医学、生物学和药物开发。
