双层膜极向Kerr效应的增强与其本征值之间的关系

RELATION BETWEEN THE INTRINSIC AND ENHANCED KERR ROTATION OF BILAYER FILMS

应用相干光迭加的普遍原理，从理论上导出了双层膜情况下，介质增强后的极向Ｋｅｒｒ角（θ＿ｋ）与磁光介质本征的极向Ｋｅｒｒ角（θ￣０＿ｋ）之间关系的解析表达式，指出了光经玻璃衬底面入射到磁光介质时测量的Ｋｅｒｒ角θ＿ｋ与磁光介质本征Ｋｅｒｒ角θ￣０＿ｋ的不同，提出了一种简便的测量θ￣０＿Ｋ的方法，并讨论了Ｋｅｒｒ角θ＿ｋ介质增强的物理原因，从理论上导出了等离子体吸收边情况下，双层膜的Ｋｅｒｒ角θ＿ｋ增强的关系式。

Based on the universal additivity law of the interference light an analytic re- presentation for the relation between the enhanced Kerr rotation θ_K and the intrinsicKerr rotation θ￣0_k of the magneto-optical materials is obtained theoretically for a bila-yer films, the difference between the measured Kerr rotation θ_k and intrinsic Kerrrotation θ￣0_k is pointed out for the case where an incident light goes through the glasssubs trate onto the magneto-optical film,a simple method for measuring the intrinsicKerr rotation θ￣0_k is given,4)the physical reason about the enhancement of Kerr ro-tation θ_k by the dielectric medium is discussed and the representation of the enha-nced Kerr rotation θ_k for a bilayer system with plasma aborption edge is deducedtheoretically.