In this paper, a new type of heterogeneous dimer of Au and In nanospheres is proposed, which refractive index (RI) sensing and surface enhanced Raman scattering (SERS) performances are numerically predicted by finite element method. It combines both LSPR advantages of Au and In. Under visible and UV light excitations, the maximum RI sensitivity factor S is revealed to reach 259 nm/RIU and 535 nm/RIU, while the maximum SERS enhancement factor reaches ∼10⁷ and 10⁵, respectively. They are improved significantly than that of monomer counterparts. The near-electric-field coupling effect on the dimer localized surface plasmon resonance (LSPR) peak wavelength, S, and the corresponding fractional shifts are discussed, which provide alternatives to estimate the gap distance in-between dimer components. It holds great promise for future designing Au, In heterogeneous nanostructure based SERS and RI sensing substrates which work efficiently both at visible and UV light regions.

本文提出了一种新型的Au和In纳米球异质二聚体，利用有限元方法对折射率（RI）传感和表面增强拉曼散射（SERS）性能进行了数值预测。它结合了Au和In的LSPR优点。在可见光和紫外光激发下，最大的RI灵敏度因子S分别达到259 nm / RIU和535 nm / RIU，而最大的SERS增强因子分别达到〜10 ⁷和10 ⁵。它们比单体对应物显着改善。近电场耦合效应对二聚体局部表面等离子体激元共振（LSPR）峰值波长S，并讨论了相应的分数偏移，它们提供了一些替代方法来估计二聚体组件之间的间隙距离。它为未来设计基于异质纳米结构的Au，SERS和RI传感基板提供了广阔的前景，该基板可在可见光和紫外光区域高效工作。