论文标题
纳米结构AG-AU混合设备中局部现场增强的图像偶极子方法
Image dipoles approach to the local field enhancement in nanostructured Ag-Au hybrid devices
论文作者
论文摘要
我们已经研究了各种纳米结构的多层设备的辐射场的等离子增强，可以在表面增强的拉曼光谱法中应用。我们采用图像偶极子方法来描述表面形态对绝对极限的场增强的影响。特别是，我们比较了纳米结构的银表面和分层的银金混合设备的性能。发现局部表面等离子体态（LSP）在银金杂种设备中提供了高场的增强，其中由于表面缺陷引起的对称破坏是一个支撑因素。将这些结果与球形对称性多壳纳米颗粒获得的结果进行比较。根据最近的实验数据的背景讨论了计算的增强因子。
We have investigated the plasmonic enhancement of the radiation field at various nanostructured multilayer devices, that may be applied in surface enhanced Raman spectroscopy. We apply an image dipole method to describe the effect of surface morphology on the field enhancement in a quasistatic limit. In particular, we compare the performance of a nanostructured silver surface and a layered silver-gold hybrid device. It is found that localized surface plasmon states (LSP) provide a high field enhancement in silver-gold hybrid devices, where symmetry breaking due to surface-defects is a supporting factor. These results are compared to those obtained for multi-shell nanoparticles of spherical symmetry. Calculated enhancement factors are discussed on the background of recent experimental data.
