Hu Li, Huang Yingzhou, Fang Liang, Chen Guo, Wei Hua, Fang Yurui
Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, P. R. China.
School of Computer Science and Information Engineering, Chongqing Technology and Business University, Chongqing, 400067, China.
Sci Rep. 2015 Nov 5;5:16069. doi: 10.1038/srep16069.
In this work, the circular dichroisms (CD) of nanorice heterodimers consisting of two parallel arranged nanorices with the same size but different materials are investigated theoretically. Symmetry-breaking is introduced by using different materials and oblique incidence to achieve strong CD at the vicinity of Fano resonance peaks. We demonstrate that all Au-Ag heterodimers exhibit multipolar Fano resonances and strong CD effect. A simple quantitative analysis shows that the structure with larger Fano asymmetry factor has stronger CD. The intensity and peak positions of the CD effect can be flexibly tuned in a large range by changing particle size, shape, the inter-particle distance and surroundings. Furthermore, CD spectra exhibit high sensitivity to ambient medium in visible and near infrared regions. Our results here are beneficial for the design and application of high sensitive CD sensors and other related fields.
在这项工作中，我们对由两个尺寸相同但材料不同且平行排列的纳米稻组成的纳米稻异质二聚体的圆二色性（CD）进行了理论研究。通过使用不同材料和斜入射引入对称性破缺，以在法诺共振峰附近实现强CD。我们证明，所有金 - 银异质二聚体均表现出多极法诺共振和强CD效应。简单的定量分析表明，具有较大法诺不对称因子的结构具有更强的CD。通过改变颗粒尺寸、形状、颗粒间距离和周围环境，CD效应的强度和峰值位置可以在很大范围内灵活调节。此外，CD光谱在可见光和近红外区域对周围介质表现出高灵敏度。我们在此的结果有利于高灵敏度CD传感器及其他相关领域的设计与应用。
