Directional coupling of light in nanophotonic circuits has recently attracted increasing interest, with numerous experimental realizations based on broken rotational or mirror symmetries of the light–matter system. The most prominent underlying effect is the spin–orbit interaction of light in subwavelength structures. Unfortunately, coupling of light to such structures is, in general, very inefficient. In this work, we experimentally demonstrate an order of magnitude enhancement of the directional coupling between two nanowaveguides by means of a whispering gallery microcavity. We also show that both transverse magnetic and transverse electric modes can be used for the enhancement.

中文翻译：

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耳语画廊微腔增强了光的定向耦合。

纳米光子电路中的光的定向耦合最近引起了越来越多的兴趣，基于光物质系统的旋转或镜像对称性破损的大量实验实现。最突出的潜在影响是亚波长结构中光的自旋轨道相互作用。不幸的是，将光耦合到这样的结构通常是非常低效的。在这项工作中，我们通过耳语的画廊微腔实验性地证明了两个纳米波导之间定向耦合的数量级增强。我们还表明，横向磁模式和横向电模式均可用于增强。