Moving from the simple concept that reflection onto a mirror surface changes the handedness of circularly polarized light, we describe what happens to the emergent polarization in two different cases after reflection on a back mirror. In the first case, a regular emitter is taken into account, where reflection has the effect to destroy the emergent polarization. In the second case, we show what could happen when a hypothetical apparently non‐reciprocal emitting material undergoes a similar experiment. These simple concepts have important implications in the design of efficient circularly polarized emitting devices.

中文翻译：

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镜子上的圆偏振光：警告和机遇。

从简单的概念（反射到镜面上改变圆偏振光的手性）出发，我们描述了在后视镜上反射后两种不同情况下出射偏振发生的情况。在第一种情况下，考虑了规则的发射器，其中反射具有破坏出射偏振的作用。在第二种情况下，我们展示了假设的似乎不可逆的发射材料经过类似的实验会发生什么。这些简单的概念在有效的圆偏振发射器件的设计中具有重要意义。