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空心方形纳米结构能够激发更大面积的增强电场,故其可以作为衬底用于表面增强拉曼散射.应用离散偶极子近似算法研究了空心方形银纳米结构的消光光谱及其近场电场分布与入射光偏振方向之间的关系.研究表明,空心方形银纳米结构的表面等离子体共振峰不随入射光偏振方向的改变而移动,但是其表面增强电场分布却强烈地依赖于入射光的偏振方向.另外,还讨论了空心方形银纳米结构间的耦合作用对其表面等离子体共振模式的影响.结果发现,可以通过调节结构间的距离来改变结构间的耦合作用,同时改变了表面等离子体共振峰的位置.这些结果将为理解闭合纳米结构表面等离子体共振方面的光学性质及闭合纳米结构间的耦合作用提供帮助,从而指导闭合纳米结构阵列的制备,以达到特定的表面等离子体共振方面应用的目的.
Hollow square nanostructures can stimulate a larger area of the enhanced electric field, so it can be used as a substrate for surface-enhanced Raman scattering.Using the discrete dipole approximation algorithm to study the hollow square silver nanostructures extinction spectrum and its near-field electric field distribution And the polarization direction of incident light.The results show that the surface plasmon resonance of hollow square silver nanostructures does not shift with the polarization direction of incident light but its surface enhanced electric field distribution strongly depends on the polarization direction of incident light In addition, the effects of coupling between hollow square silver nanostructures on the surface plasmon resonance modes are also discussed.The results show that the coupling between the structures can be changed by adjusting the distance between the structures, and the surface plasmon resonance These results will help to understand the optical properties of closed nanostructured surface plasmon resonance and the coupling between closed nanostructures to guide the preparation of closed nanostructure arrays for specific surface plasmon resonance applications the goal of.