利用有限元(Finite element method, FEM)方法系统研究Au-ITO-Ag对称性破缺三层纳米核壳二聚体的近场增强特性, 并采用等离激元杂化理论对其局域表面等离子体共振(Localized Surface Plasmon Resonance, LSPR)特性进行解释。研究结果表明, 对称性破缺三层纳米核壳二聚体光谱中等离子体共振峰峰位对Au内核半径的变化极为敏感; 对称性破缺三层核壳纳米颗粒的电场主要分布在纳米核壳二聚体的表面上, Ag外壳纳米杯缺口部分的电场强度最为突出, 其高度可调节的光学特性为提高生物传感技术提供了坚实的理论基础。

Au-ITO-Ag symmetry-breaking multilayered nanoshells dimer were systematically investigated by near field enhancement characteristics based on the finite element method. The localized surface plasmon resonance properties are explained by the plasmon hybridization theory. The results show that the plasmon resonance peak of the symmetry-breaking multilayered nanoshells dimer is very sensitive to the change of the radius of the Au core. The electric field of the symmetry-breaking multilayered nanoshells dimer is mainly distributed on the surface of the nanoshells dimer, and the electric field intensity is most prominent in the Ag nanocup opening part, whose highly adjustable optical properties provide a solid theoretical basis for improving biosensor technology.