In this paper, we studied the hybrid surface plasmons excited by the heterogeneous composite structure of Au nano-array and Ag film via surface enhanced Raman scattering (SERS). By using the finite difference time domain method, the surface plasmon resonances are adjusted to the excitation wavelength of Raman scattering, and the optimized geometric parameters of the structure with the dual-wavelength excitation characteristic are obtained. Utilizing the structure with above parameters which fabricated by electron beam lithography as SERS substrate, the Raman spectra at two excitation wavelengths were gained. The experimental results demonstrate that the heterogeneous composite structure can simultaneously excite two different types of surface plasmons. This work can provide a good reference for the future design of nano-devices based on surface plasmon.

在本文中，我们通过表面增强拉曼散射（SERS）研究了金纳米阵列和银膜的异质复合结构激发的杂化表面等离子体激元。通过时域有限差分法，将表面等离子体共振调整为拉曼散射的激发波长，得到具有双波长激发特性的结构的优化几何参数。利用通过电子束光刻技术制造的具有上述参数的结构作为SERS衬底，获得了两个激发波长的拉曼光谱。实验结果表明，异质复合结构可以同时激发两种不同类型的表面等离子体激元。