Abstract A surface enhanced Raman scattering (SERS) substrate, Au nanodisk and Au film coupling structure with two surface plasmons resonant wavelengths is proposed. Finite-difference time-domain (FDTD) method was used to numerically optimize the parameters of the structure. The Raman characteristics of the substrate were experimentally studied, and the enhancement factor reached 2.9 × 10 4 . The results show that the substrate is capable of performing SERS detection at two wavelengths, and has good SERS characteristics at both wavelengths. The SERS substrate has good uniformity, high physical stability, and no restrictions on the direction of linearly polarized light, which greatly improves the convenience and practicality of Raman detection.

中文翻译：

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基于Au纳米盘和Au膜耦合结构激发的混合表面等离子体的表面增强拉曼散射

摘要 提出了一种具有两种表面等离子体共振波长的表面增强拉曼散射(SERS)衬底、Au纳米盘和Au膜耦合结构。采用时域有限差分(FDTD)方法对结构参数进行数值优化。实验研究了衬底的拉曼特性，增强因子达到了2.9×10 4 。结果表明，该衬底能够在两个波长下进行SERS检测，并且在两个波长下都具有良好的SERS特性。SERS基板均匀性好，物理稳定性高，对线偏振光的方向没有限制，大大提高了拉曼检测的方便性和实用性。