采用离散偶极近似(DDA)法计算直线、平面和立方体排列的银纳米球阵列的消光谱及其电场分布情况。研究表明，银纳米球阵列的表面等离子体共振峰随银纳米球直径的增大而红移，随纳米球个数的增多而蓝移；不同结构银纳米球阵列间的耦合作用对其表面等离子体共振模式有显著影响，相同直径的银纳米球阵列耦合作用由强到弱的排列方式分别为平面排列、立方体排列、直线排列；银纳米球阵列的光谱特性与入射光偏振态的变化密切相关。

The extinction spectra and electric field distribution of silver nanosphere arrays positioned in a line, plane or cube are calculated by discrete dipole approximation. It is demonstrated that the surface plasmon resonance peaks of extinction spectra are red-shifted with the increase of silver nanosphere diameter and blue-shifted with the increase of the number of nanospheres. The coupling effects of silver nanoparticles with different structures between arrays have a significant impact on their surface plasmon resonance mode. It is found that the electric field coupling effects of silver nanosphere arrays positioned in a plane, cube and line is weakened in the order, when the arrays have the same diameter. The spectral characteristics of nanosphere arrays are closely related to the changes of polarization state of the incident light.