诺共振
多极展开
激发
材料科学
等离子体子
偶极子
共振(粒子物理)
法诺平面
平面的
纳米结构
分子物理学
光电子学
纳米技术
旋光
凝聚态物理
手性(物理)
物理
光学
原子物理学
手征异常
量子力学
几何学
计算机图形学(图像)
数学
Nambu–Jona Lasinio模型
费米子
计算机科学
作者
Shuai Zu,Yanjun Bao,Zheyu Fang
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2016-01-01
卷期号:8 (7): 3900-3905
被引量:111
摘要
A strong chiral optical response induced at a plasmonic Fano resonance in a planar Au heptamer nanostructure was experimentally and theoretically demonstrated. The scattering spectra show the characteristic narrow-band feature of Fano resonances for both left and right circular polarized lights, with a chiral response reaching 30% at the Fano resonance. Specifically, we systematically investigate the chiral response of planar heptamers with gradually changing the inter-particle rotation angles and separation distance. The chiral spectral characteristics clearly depend on the strength of Fano resonances and the associated near-field optical distributions. Finite element method simulations together with a multipole expansion method demonstrate that the enhanced chirality is caused by the excitation of magnetic quadrupolar and electric toroidal dipolar modes. Our work provides an effective method for the design of 2D nanostructures with a strong chiral response.
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