假设橘色是探测器，只想记录反射的能量
如何让探测器只记录单方向的光线
+3+3方法一：front only flag
方法二：给光源赋偏振态，中间放个四分之一波片，光线走两次以后方向就变了，再丢个polarization flag选择偏振方向。这个方法的弊端可以思考一下。附件有模型，不用自己搭建。
+3Some articles that may help understand the polarization behavior:
How to model and design real waveplate in OpticStudio – Knowledgebase (zemax.com)
How to model a birefringent polarization rotator? | Zemax Community
Investigating OpticStudio’s polarization features – Knowledgebase (zemax.com)
How to use the Jones Matrix surface – Knowledgebase (zemax.com)
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