Despite numerous works devoted to light scattering in multilayer optics, trapped scattering has not been considered until now. This consists in a roughness-coupling process at each interface of the multilayer, giving rise to electromagnetic modes traveling within the stack. Such a modal scattering component is today necessary for completing the energy balance within high-precision optics including mirrors for gyro-lasers and detection of gravitational waves, where every ppm (part per million) must be accounted for. We show how to calculate this trapped light and compare its order of magnitude with the free space scattering component emerging outside the multilayer.

中文翻译：

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光学涂层内的俘获光散射：多层粗糙度耦合过程

尽管有许多工作致力于多层光学中的光散射，但直到现在还没有考虑过捕获散射。这包括在多层的每个界面处的粗糙度耦合过程，产生在堆叠内传播的电磁模式。如今，这种模态散射组件对于完成高精度光学器件中的能量平衡是必需的，包括用于陀螺仪激光器的反射镜和引力波检测，其中每 ppm（百万分之一）都必须考虑在内。我们展示了如何计算这种被捕获的光，并将其数量级与多层外出现的自由空间散射分量进行比较。