干涉型倏逝光光开关的理论研究
A Theoretical Study on an Optical Switch Using Interfered Evanescent Light
摘要：
在一个由真空平板组成的光学结构中，我们从麦克斯韦方程组出发，计算了两束入射光的两个输出光强随切口角、光强比、两束入射光的相位差和真空层厚度的变化，其中两束输入光来自具有相同切入角的上、下介质区，其中一束输出光进入上介质，另一束进入下介质。我们已经发现，当倏逝光存在于上边界和下边界处并且彼此干涉时，对于输入光比率和真空层厚度的任何组合，存在一组切口角和相位差，其中输出光之一变为零。这一发现将可能导致一种创新的光开关，利用该光开关，可以利用强度远低于输出光的强度的控制光来接通和关断光输出光。
英文摘要：
In an optical configuration consisting of a flat plate of vacuum between upper and lower spaces of uniform dielectric regions of n>1, we have calculated two output light intensities for two input lights from the Maxwell's equations as functions of the incision angle, a light intensity ratio, a phase difference of the two input lights, and a thickness of the vacuum layer, where the two input lights come from upper and lower dielectric regions with the same incision angles, and one of the output light goes into upper dielectric and the other goes into lower dielectric. We have found that, when evanescent lights exist at the upper and lower boundary and interfere each other, there is one set of incision angles and phase differences for any combination of an input light ratio and a thickness of the vacuum layer where one of output lights becomes zero. This finding will possibly lead to an innovative optical switch with which an optical output light can be switched on and off with a control light with an intensity much lower than that of the output light.
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