摘要
利用时域有限差分法(FDTD)研究了纳米环八聚体和劈裂纳米环八聚体的消光光谱及其近场分布。研究结果表明,当入射光偏振方向不同时,纳米环八聚体和劈裂纳米环八聚体都产生法诺共振现象,通过调整八聚体外部4个纳米环间夹角的大小,不仅可以使纳米环八聚体和劈裂纳米环八聚体产生多重法诺共振,还可以对法诺共振的调制深度及共振波长进行调谐,以满足在表面增强拉曼散射、生物分子或化学分子探测中的应用。
The extinction spectra and distribution of electric near field of the octamer clusters composed of nanorings and split nanorings are calculated by using the finite-difference time-domain method （FDTD）. The results show that the Fano resonances are generated in the plasmonic octamer clusters composed of nanorings and split nanorings with different incident light polarizations. In addition, multiple Fano resonances can be generated and the modulation depth and resonance wavelength of Fano resonances can be tuned by adjusting the angle of the external ring of the plasmonic octamer clusters. These results can be used in Raman scattering, biological and chemical molecule detection.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第6期277-284,共8页
Laser & Optoelectronics Progress
关键词
表面光学
表面等离激元共振
法诺共振
时域有限差分法
optics at surface
surface plasmon resonance
Fano resonances
finite-difference time-domain method
