表面电磁振荡激元波(SPW)谐振是金属膜参数及其表面状态的十分灵敏的函数。因而利用SPW技术可以精确地确定金属膜及其表面污染层的光学常数。本文利用经典的薄膜光学方法讨论了SPW的激发及其理论计算。并在Kretschmann装置上测量了SPW谐振反射率,借助于最优化技术计算了薄膜和表面层的光学常数。最后给出了Ag、Au、Cu和Al膜及以诸如Ag2S、CuOx和Al2O3等表面层的实验结果。

The surface plasma waves (SPW) resonance is a sensitive function of the optical constants of metallic films and their surface conditions. Thus, the optical constants of metallic films and contamination layers on its surface could be determined precisely by using the SPW technique. In this paper, analysis and theoretical calculation of the SPW with traditional thin film optics are discussed. The Kretschmann arrangement is used to measure the SPW resonance reflectance. And with aid of an optimization method the optioal constants are calculated. Some experimental results on Ag，Au, Cu, Al and surface layers, such as AgaS, CuO2 and Al2O3 are given.