一种具有二维各向同性旋光性、可将入射偏振旋转90°的打结型超分子
A Knotted Meta-molecule with 2-D Isotropic Optical Activity Rotating the Incident Polarization by 90°
AI总结：
针对传统手性分子缺乏各向同性旋光性的问题，提出一种手性环面纽结超分子，可实现90°偏振旋转，并具备二维各向同性旋光性，已在微波频段获实验验证。
摘要：
旋光性是手性材料旋转线偏振（LP）电磁波的能力。由于其内在的不对称性，传统手性分子通常缺乏各向同性表现，或者最多仅具有微弱的手性。在此，我们引入了一种打结手性超分子，其展现出的旋光性对应于入射波90°的偏振旋转。更重要的是，由于手性环面纽结结构具有连续的多重旋转对称性，观察到的偏振旋转行为被发现与入射波的偏振方式无关。换言之，如图1所示，所提出的手性纽结结构具有二维（2-D）各向同性旋光性，这已在微波频谱中得到实验验证。所提出的手性环面纽结代表了迄今为止报道的、对入射偏振具有本征各向同性的最具旋光活性的超分子。
英文摘要：
Optical activity is the ability of chiral materials to rotate linearly-polarized (LP) electromagnetic waves. Because of their intrinsic asymmetry, traditional chiral molecules usually lack isotropic performance, or at best only possess a weak form of chirality. Here we introduce a knotted chiral meta-molecule that exhibits optical activity corresponding to a 90° polarization rotation of the incident waves. More importantly, arising from the continuous multi-fold rotational symmetry of the chiral torus knot structure, the observed polarization rotation behavior is found to be independent of how the incident wave is polarized. In other words, the proposed chiral knot structure possesses two-dimensional (2-D) isotropic optical activity as illustrated in Fig. 1, which has been experimentally validated in the microwave spectrum. The proposed chiral torus knot represents the most optically active meta-molecule reported to date that is intrinsically isotropic to the incident polarization.
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