光学远场量的准正规模展开
Quasinormal mode expansion of optical far-field quantities
摘要：
准简正模展开是分析纳米谐振腔中光与物质相互作用的常用方法。然而，扩大远场量，如能量通量是一个开放的问题，因为QNM发散与距离的谐振系统的增加。我们引入了一个理论来严格计算远场量的模态展开。所提出的方法是基于QNM的复本征频率。发散问题是通过使用轮廓积分与分析延续的远场量到复频率平面规避。我们通过计算纳米光子器件远场的角分辨模态能流来证明这种方法。
英文摘要：
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.
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