镜面旋光性：从电磁宇称不确定性进行有效的手征传感
Mirror optical activity: efficient chiral sensing from electromagnetic parity indefiniteness
摘要：
镜像对称是物理学中最基本的概念之一，它在分子水平上的自发破缺允许手性分子以两个互为镜像的对映体存在。常规用于检测混合物中的对映体的大多数手性光学效应，如圆二色性，依赖于对光子圆偏振的手性灵敏度，因此不能利用镜像对称性破缺的全部潜力，镜像对称性破缺也涉及辐射空间分布。在这里，我们表明，与手性物质相互作用的电磁场的宇称不确定性支持镜像光学活性，一种新颖的手征光学效应，其中手性膜，一旦探测的纳米发射器的镜像对称场，产生近场的空间分布打破镜像对称。近场不对称性的检测提供了一种高效的手性传感技术，从而开辟了新的途径，设计纳米光子计划的超高效手性歧视皮克数量的分子。我们专门的技术与红外手性纳米薄膜，通过使用一个快速的电子在超然配置的纳米发射器和离轴透明导体纳米粒子作为近场探针;纳米粒子阴极射线发光的空间不对称因子是一个数量级大于圆二色性，这是进一步增强到两个订单，如果额外的石墨烯片沉积在膜界面上。
英文摘要：
Mirror symmetry is among the most fundamental concepts of physics and its spontaneous breaking at the molecular level allows chiral molecules to exist in two enantiomers that are mirror images of each other. The majority of chiro-optical effects routinely used to detect enantiomers in mixtures, as circular dichroism, relies on chiral sensitivity to photon circular polarization, thus not harnessing the full potentials of mirror symmetry breaking which also involves the radiation spatial profile. Here we show that the parity indefiniteness of the electromagnetic field interacting with chiral matter supports mirror optical activity, a novel chiro-optical effect where a chiral film, once probed by the mirror symmetric field of a nanoemitter, produces a near field whose spatial profile has broken mirror symmetry. The detection of near field dissymmetry provides an highly efficient chiral sensing technique, thus opening novel avenues to devising nanonophotonic schemes for ultra-efficient chiral discrimination of picogram quantities of molecules. We specialize the technique to nano-films with infrared chirality by using a swift electron in aloof configuration as the nanoemitter and an off-axis transparent conductor nanoparticle as the near field probe; the spatial dissymmetry factor of nanoparticle cathodoluminescence is one order of magnitude larger than circular dichroism, which is further enhanced to two orders if an additional graphene sheet is deposited on the film interface.
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