探究径向偏振矢量光与氧化石墨烯/金纳米棒复合结构的相互作用,以提高表面增强拉曼散射性能。基于FDTD Solutions软件,得到氧化石墨烯/单金纳米棒复合基底在径向偏振光激发下的表面增强拉曼散射增强因子达到10 ⁸,比相同条件下线偏振光激发的大6个数量级。这种性能提高的物理机制源于径向偏振光激发金纳米棒的电磁增强与氧化石墨烯产生的本征化学增强。进一步详细讨论了径向偏振光激发下氧化石墨烯厚度、金纳米棒数量和排列方式对表面增强拉曼散射性能的影响。基于径向矢量光场激发多功能基底的表面增强拉曼散射性能调控在生物化学、食品安全与传感检测等领域具有巨大的应用潜力。

The interaction between the radially polarized vectorial light and GO/AuNRs composite structures is studied to boost the SERS performance. Based on the simulation of the finite-difference time-domain solutions software, the SERS enhancement factor of the GO/single-AuNR composite substrate illuminated by the radially polarized light is up to 10 8, which is six orders of magnitude greater than that achieved by linearly polarized light under the same conditions. The physical mechanisms for this performance improvement are due to both the electromagnetic enhancement of gold nanorods excited by the radially polarized light and intrinsically chemical enhancement afforded by the GO film. Furthermore, the effects of different GO thicknesses and the number and arrangement of gold nanorods on the properties of SERS with radially polarization illumination are discussed in detail. The performance control of the SERS based on radial-vector light field bestirring the multifunctional substrate has great potential in biochemistry, food safety, and sensor detection.