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以对称性破缺Au-ITO-Ag纳米核壳结构为研究对象,采用有限元法系统研究其LSPR消光特性的影响因素及变化规律,运用等离激元杂化理论对其LSPR现象进行解释。研究结果表明:纳米核壳的消光特性对入射光偏振方向极其敏感;当入射光偏振方向垂直和平行于对称轴方向时,横向模式︱ω_⊥〉和轴向模式︱ω_//〉可产生多个偶极和高阶共振模式;通过改变Au内核的半径,3层纳米核壳的LSPR共振模式可调谐至近红外区域,在生物传感器和选择性滤波器应用方面潜力巨大。
The symmetry breaking Au-ITO-Ag nanoshells was taken as the research object. Finite element method was used to study the influencing factors and variation regularity of LSPR extinction properties. The LSPR phenomenon was explained by the plasmons theory. The results show that the extinction property of the nanoshells is very sensitive to the polarization direction of the incident light. When the polarization direction of the incident light is perpendicular and parallel to the symmetry axis, the transverse mode ︱ω_⊥> and the axial mode ︱ω_ //> can produce more Dipole and high-order resonance modes. By changing the radius of the Au core, the LSPR resonance mode of the three-layer nano-core shell can be tuned to the near-infrared region and there is great potential for biosensors and selective filter applications.