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 on 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 2 orders of magnitude the local density of optical chirality and, thus, the CD signal obtained from a given molecular sample on its vicinity.

中文翻译：

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周期性双重纳米结构的表面增强圆二色性光谱

背景技术提高手性光谱技术如圆二色性（CD）光谱法的灵敏度是纳米光子学研究领域中的当前愿望。增强CD光谱学取决于两个互补的要求：被研究分子感知的电磁场的增强和由对偶对称性保证的那些场的螺旋度的守恒。在这项工作中，我们介绍了一种系统的方法来设计能够共振增强分子CD光谱学的纳米结构双周期光子系统。作为说明，我们设计了一个双1D硅纳米颗粒阵列，并显示了其集体的光学模式可以有效地用于共振地提高2个数量级的光学手性的局部密度，因此，