Tang Yuxia, Huang Yingzhou, Qv Linhong, Fang Yurui
Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, China.
School of Computer Science and Information Engineering, Chongqing Technology and Business University, Chongqing, 400067, China.
Nanoscale Res Lett. 2018 Jul 5;13(1):194. doi: 10.1186/s11671-018-2600-8.
Metal nanoparticle-film system has been proved that it has the ability of focusing light in the gap between particle and film, which is useful for surface-enhanced Raman scattering and plasmon catalysis. The rapid developed plasmonic chirality can also be realized in such system. Here, we investigated an electromagnetic energy focusing effect and chiral near-field enhancement in a coupled chiral particle chain on gold film. It shows large electric field enhancement in the gap between particle and film, as well as chiral near field. The enhancement properties at resonant peaks for the system excited by left circularly polarized light and right circularly polarized light are obviously different. This difference resulted from the interaction of circularly polarized light and the chiral particle-film system is analyzed with plasmon hybridization. The enhanced optical activity can provide promising applications for the enhancement of chiral molecule sensor for this chiral particle chain-film system.
金属纳米颗粒-薄膜系统已被证明具有在颗粒与薄膜之间的间隙中聚焦光的能力，这对于表面增强拉曼散射和等离子体催化很有用。在这种系统中也可以实现快速发展的等离子体手性。在此，我们研究了金膜上耦合手性颗粒链中的电磁能量聚焦效应和手性近场增强。结果表明，在颗粒与薄膜之间的间隙以及手性近场中存在较大的电场增强。左旋圆偏振光和右旋圆偏振光激发的系统在共振峰处的增强特性明显不同。利用等离子体杂化分析了圆偏振光与手性颗粒-薄膜系统相互作用产生这种差异的原因。这种增强的光学活性为该手性颗粒链-薄膜系统用于增强手性分子传感器提供了广阔的应用前景。
