为了更好的理解相位型、偏振型及调制型表面等离子体波共振(SPR)传感器的工作原理和性能,采用光的电磁理论对光激发表面等离子体波时光的反射系数rp在复平面的轨迹进行了分析与研究。研究表明rp在复平面的轨迹近似在一个圆周上,从这个轨迹圆不仅可以得到反射系数的模rp和辐角φp的特性,而且可以得到rp.(φp/α)近似为一个常数的特性。这些特性非常直观地表示了相位型、偏振型及调制型SPR传感器的原理与性能,有利于SPR传感器的研究。 In order to better understand the operating principle and performance of phase, polarization and modulated surface plasmon resonance (SPR) sensors, using the electromagnetic theory of light, the reflection coefficient rp of the photoexcited surface plasmon wave time-of-light The trajectory is analyzed and studied. The results show that the trajectory of rp in the complex plane approximates a circle. From this trajectory circle, not only the properties of mode rp and angle φp of reflection coefficient can be obtained, but also rp. (φp / α) Constant characteristics. These characteristics very intuitively shows the principle and performance of phase, polarization and modulation SPR sensors, is conducive to SPR sensor research.