论文标题
光学远场数量的准模式扩展
Quasinormal mode expansion of optical far-field quantities
论文作者
论文摘要
准标准模式（QNM）扩展是分析纳米孔子中光 - 物质相互作用的流行工具。但是，扩大远场数量（例如能量通量）是一个开放的问题，因为QNM与谐振系统的距离增加。我们介绍了一种理论，以严格计算远场数量的模态扩展。提出的方法基于QNM的复杂特征频率。通过使用轮廓积分与远场量的分析延续到复杂频率平面的分析延续，可以规避差异问题。我们通过计算纳米仪设备远场的角度分辨模态通量来证明该方法。
Quasinormal mode (QNM) expansion is a popular tool to analyze light-matter interaction in nanoresonators. However, expanding far-field quantities such as the energy flux is an open problem because QNMs diverge with an increasing distance to the resonant systems. We introduce a theory to compute modal expansions of far-field quantities rigorously. The presented approach is based on the complex eigenfrequencies of QNMs. The divergence problem is circumvented by using contour integration with an analytical continuation of the far-field quantity into the complex frequency plane. We demonstrate the approach by computing the angular resolved modal energy flux in the far field of a nanophotonic device.
