论文标题
周期性双纳米结构上表面增强的圆二色症光谱
Surface-Enhanced Circular Dichroism spectroscopy on periodic dual nanostructures
论文作者
论文摘要
手性光谱技术（例如圆形二色性（CD）光谱）的敏感性是纳米光子学研究领域的一种攻击。增强CD光谱取决于两个互补要求：研究分子所感知的电磁场的增强和通过二元对称性保证的这些磁场的螺旋性的保存。在这项工作中，我们引入了一种系统的方法，以设计能够增强分子CD光谱的纳米结构双周期光子系统。作为例证，我们设计了双1D硅纳米颗粒阵列，并表明它的集体光学模式可以有效地通过两个数量级来共振，以增强光学手性的局部密度，因此，从其胶合度上获得的分子样品获得的CD信号。
Increasing the sensitivity of chiral spectroscopic techniques such as circular dichroism (CD) spectroscopy is a current aspiration in the research field of nanophotonics. Enhancing CD spectroscopy depends upon of two complementary requirements: the enhancement of the electromagnetic fields perceived by the molecules under study and the conservation of the helicity of those fields, guaranteed by duality symmetry. In this work, we introduce a systematic method to design nanostructured dual periodic photonic systems capable of enhancing molecular CD spectroscopy resonantly. As an illustration, we engineer a dual 1D silicon nanoparticle array and show that its collective optical modes can be efficiently employed to resonantly enhance by two orders of magnitude the local density of optical chirality and, thus, the CD signal obtained from a given molecular sample on its vicinity.
