论文标题
通过电二极偶极子共振的纳米霍尔斯的电和磁性偶极子共振增强了圆形二色性
Surface Enhanced Circular Dichroism by Electric and Magnetic Dipole Resonance of Cross Shaped Nanoholes
论文作者
论文摘要
等离子体纳米结构和手性分子的近场相互作用诱导了刺激性纳米结构中的圆二色性。诱导的圆二色性（ICD）强度大于分子固有CD（MCD）的几个阶，并且通常出现在视觉范围（VR），易于检测到CD信号。因此，ICD被认为是检测单分子手性的潜在方法。在这项研究中，提出了跨形纳米霍尔（CSN）来增强MCD信号。结构的最大增强达到了450倍的分子固有MCD。通过对表面等离子体共振模式的分析，发现CSN中电偶极子（ED）和磁偶极子（MD）表面等离子体共振（SPR）重叠对于CD增强至关重要。此外，我们研究了结构的厚度，纳米荷尔的长度长度和较短的臂，纳米霍尔的较短臂的位移以及CSN的较短臂对圆形二色性增强的影响，并发现CD增强峰的增强因子和位置是由CD增强峰进行调谐的位置。
The near-field interaction of plasmonic nanostructures and chiral molecules induces circular dichroism in achiral nanostructure. The induced circular dichroism (ICD) strength is several orders greater than the molecular inherent CD (MCD), and it generally appears at visual range (VR) where the CD signal is easily detectable. Therefore, the ICD is considered as a potential method to detect single molecular chirality. In this study, cross shaped nanohole (CSN) is proposed for enhancing the MCD signal. The maximum enhancement of the structure reached 450 folds of molecular inherent MCD. Through analysis of the surface plasmon resonance mode, it is found that overlapping of the electric dipole (ED) and magnetic dipole (MD) surface plasmon resonance (SPR) in CSN is essential for the CD enhancement. Furthermore, we investigated the effects of the thickness of structure, length of longer and shorter arms of nanohole, the displacement of shorter arm of the nanohole and x period of CSN on the circular dichroism enhancement, and found the enhancement factor and location of CD enhancement peak to be tunable by the structural parameters
