三角缺口正三角形纳米结构的共振模式

Resonance mode of an equilateral triangle with triangle notch

设计了一个三角缺口三角形破缺纳米结构,它是从正三角形底边切掉一个三角切片所构成.应用离散偶极子近似方法研究了其消光光谱及表面电场分布.结果发现,该破缺纳米结构的消光光谱中出现了具有Fano共振的线形.分析表明,这个Fano共振线形是由绑定与反绑定混合表面等离激元模式相互作用所致.研究了三角缺口三角形纳米结构的结构参数对Fano共振的影响.

A symmetrically breaking nanostructure, equilateral triangle with triangle notch, is designed. The extinction spec-trum and surface electric field distribution on the structure surface are investigated by the discrete dipole approximation method. The results show that a Fano resonance line-shape occurs in the extinction spectrum, which results from the in-terference between the bonding and antibonding hybridized plasmon resonance. The effects of the structural parameters of the symmetrically breaking nanostructure on resonance mode are also studied.