激光与光电子学进展, 2015, 52 (2): 022401, 网络出版: 2015-01-19
等离子体四聚体中法诺共振的调制 下载: 860次
Modulation of Fano Resonance in Plasmonic Quadrumer Clusters
摘要
利用时域有限差分法(FDTD)模拟研究了纳米环四聚体和双开口劈裂纳米环四聚体两种结构中的法诺共振现象及其近场分布。研究结果表明,纳米环四聚体的消光光谱中可以观察到一个明显的法诺共振,双开口劈裂纳米环四聚体的消光光谱中可以观察到双重法诺共振,在消光光谱中新出现的法诺共振的起因是四聚体中的劈裂纳米环形成了暗的四极共振模式。通过调整四聚体中纳米环间夹角和间距的大小,可以很大的调谐法诺共振的光谱位置和调制深度。研究结果对纳米环四聚体和双开口劈裂纳米环四聚体这两种结构应用于表面增强拉曼散射和生物传感等方面具有重要的指导意义。
Abstract
The finite difference time domain method (FDTD) is used to investigate the phenomenon of Fano resonance and near field distribution in the quadrumer clusters comprising nanorings or split nanorings with two gaps. The calculation results show that one prominent Fano resonance is observed in the extinction spectra of quadrumer cluster composed of nanorings and double Fano resonances are obversed in the quadrumer cluster comprising of split-nanorings. The new Fano resonance appearing in the spectra is caused by the split nanorings in quadrumer cluster forming the dark quadrupole mode. The spectral position and modulation depth of Fano resonance can be largely tuned by adjusting the angle and separation of the nanorings. These results can be used as guideline in multiwavelength surface-enhanced Raman scattering and biosensing.
黄运欢, 殷丽艳, 蔡东进, 齐信, 薛保平. 等离子体四聚体中法诺共振的调制[J]. 激光与光电子学进展, 2015, 52(2): 022401. Huang Yunhuan, Yin Liyan, Cai Dongjin, Qi Xin, Xue Baoping. Modulation of Fano Resonance in Plasmonic Quadrumer Clusters[J]. Laser & Optoelectronics Progress, 2015, 52(2): 022401.