Wang Mingyan, Wang Fei, Qu Yu, Wang Tiankun, Chen Yuyan, Bai Yu, Zhang Zhongyue
Appl Opt. 2018 Aug 10;57(23):6721-6724. doi: 10.1364/AO.57.006721.
Circular dichroism (CD) is a signal that characterizes the optical properties of chiral structures. Structures with intense CD signals have valuable applications in molecular chemistry, pharmaceuticals, and biosensing. This work proposes the use of a nanowire to increase the CD signal of crossed nanorods. The separation of resonant wavelengths of transmission under left-handed and right-handed circular polarization incidence (LCP and RCP) increases because the electric interaction between the upper nanorod and nanowire under LCP incidence is different from that under RCP incidence. The increased separation of resonant wavelengths, in turn, enhances the CD signals. In addition, two new CD modes appear, and these modes can be tuned by changing the structural parameters of the proposed structure. The present results will guide the design of plasmonic chiral nanostructures for enhancing the CD signal.
圆二色性（CD）是一种表征手性结构光学性质的信号。具有强烈CD信号的结构在分子化学、制药和生物传感领域有着重要应用。这项工作提出使用纳米线来增强交叉纳米棒的CD信号。左旋圆偏振入射（LCP）和右旋圆偏振入射（RCP）下透射共振波长的分离增加，这是因为LCP入射下上纳米棒与纳米线之间的电相互作用不同于RCP入射下的相互作用。共振波长分离的增加反过来增强了CD信号。此外，还出现了两种新的CD模式，并且可以通过改变所提出结构的结构参数来对这些模式进行调谐。目前的结果将指导用于增强CD信号的等离子体手性纳米结构的设计。
