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本文使用FDTD法对典型尺寸的银纳米三角片二聚体在不同偏振光源及不同聚集结构下的近场辐射特性进行了模拟计算,结果发现:不同光源偏振方向和粒子聚集结构能够显著影响银纳米三角片的辐射特性和场增强效应的空间分布。偏振方向垂直于边长时,三种聚集结构的场增强系数最大值均大于偏振方向平行于边长时的情况,并且在点对点结构下,两粒子的中间位置处具有最强的场增强效应。
In this paper, the FDTD method was used to simulate the near-field radiation characteristics of typical size silver nanodiallet dimers under different polarized light sources and different aggregated structures. The results show that the polarization direction of different light sources and the particle aggregation structure can significantly affect the properties of silver nano Spatial distribution of the radiation characteristics and field enhancement effect of triangular plates. When the polarization direction is perpendicular to the side length, the maximum values of the field enhancement coefficients of the three kinds of aggregate structures are larger than those when the polarization direction is parallel to the side length. Under the point-to-point structure, the maximum field enhancement effect is obtained at the middle position between the two particles.