表面等离子体波检测的新技术研究

报道表面等离子体波的一种新的检测技术，可以同时获得表面等离子体波激发过程中反射光的相位和光强变化。理论计算表明，表面等离子体激发过程中，Ｐ偏振反射波相位的变化可达３００°。在此基础上建立了光学外差测量装置，可同时获得相位和强度变化的信息，实验数据和理论计算吻合非常好。此方法比仅能给出强度变化的角度扫描衰减全反射（ＡＴＲ）方法，提供了更多的信息，而且相位检测比强度检测灵敏度高，为表面光学性质的研究、ＬＢ膜特征研究以及表面等离子体波传感器的研究提供了更有力的工具。

A New Technique for Studying Surface Plasma

A new technique for studying surface plasma is reported. With this technique, the phase and amplitude information of the reflection light can be detected as surface plasma is excited. Theory shows that the phase of P polarization can change from 180° to～-120° during the excitation of surface plasma. An optical heterodyne system for measuring phase and amplitude is set up. Not only phase and amplitude information can be detected at the same time, but also the sensitivity is better than that of the ART method. This new methot can be used for studying LB film and surface sensors.