The inherent weak nature of chiroptical signals provided by typical polarimetric measurements of natural optically active media has led to the development of different techniques to achieve enhanced chiral sensing. Intuitively, the introduction of gain could provide the desired enhancement; however, this requires gain media that can couple directly to the chiral medium. Here, it is shown that nanophotonic systems that generate collinear electric and magnetic dipole moments can mediate the coupling between the gain and chiral medium, leading to signals stronger than those achieved by the chiral medium alone or when combined with the same nanophotonic system without gain. Depending on how strongly gain couples with the nanophotonic system, both background amplification and loss compensation are possible. In this context, it also is shown that the enhancement occurs within the regime of loss compensation, because background amplification may also result in amplified transmitted fields, but does not guarantee the enhancement of chiroptical signals.

中文翻译：

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使用具有增益的非手性超表面增强手性传感

由天然光学活性介质的典型偏振测量提供的手性信号的固有弱性质导致了不同技术的发展，以实现增强的手性传感。直观地说，增益的引入可以提供所需的增强；然而，这需要可以直接耦合到手性介质的增益介质。在这里，表明产生共线电偶极矩和磁偶极矩的纳米光子系统可以调节增益和手性介质之间的耦合，导致信号比单独使用手性介质或与没有增益的相同纳米光子系统组合时获得的信号更强。根据增益与纳米光子系统耦合的强度，背景放大和损耗补偿都是可能的。在这种情况下，