摘要
基于琼斯矩阵的推导提出一种金属手性纳米结构-双层开口环阵列结构,其开口方向扭转一定角度以破坏对称性,并应用有限元方法研究圆二色性(CD)特性.研究表明:在左旋圆偏振光与右旋圆偏振光的激发下,该结构表现出巨大差异使得CD产生,其CD值达到0.34.结构的电流分布表明,在短波长处,上下层圆环的等效偶极子耦合可形成反键模式,在长波长处,上下层圆环的等效偶极子耦合可形成成键模式,研究结构参数对CD的影响.理解圆二色的物理机制,并提供一种设计手性结构的方法.
Based on Jones matrix, we propose a metal nanostructure consisting of double-layer split rings, in which the opening direction between up and down split rings is twisted to break symmetry. CD effect of the nanostructure and mechanism is studied with finite element method. It shows that under excitation of left-handed circularly polarized light and right-handed circularly polarized light the structure shows different transmission. Its CD value reaches 0.34. Current density distributions show that at short resonant wavelengths equivalent dipoles of upper and bottom split-rings form antibonding mode, and at long resonant wavelengths equivalent dipoles of upper and bottom split-rings form bonding mode. These results facilitates understanding of physical mechanism of CD. It provides a way to design chiral nanostructure.
作者
温小静
屈瑜
陈城钊
WEN Xiaojing;QU Yu;CHEN Chengzhao(School of Physics and Electronic Engineering, Hanshan Normal University,Chaozhou 521041,Guangdong,China;School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, Shaanxi,China)
出处
《计算物理》
EI
CSCD
北大核心
2019年第3期357-362,共6页
Chinese Journal of Computational Physics
基金
广东省自然科学基金项目(2016A030307038)
广东省教育厅创新强校项目(2015KTSCX090)
韩山师范学院校级青年项目(自然科学类)(LQ201802)资助
关键词
手性
表面等离激元
有限元方法
圆二色性
chirality
surface plasmon
finite element method
circular dichroism
