The article entitled “Fast and accurate electromagnetic field calculation for substrate-supported metasurfaces using the discrete dipole approximation (DDA)” written by W. Liu and E. McLeod presents a method for computing the Green function in presence of a substrate or multilayer in an efficient way. Unfortunately, the proposed method has been known for more than twenty years and significantly ameliorated. It can be found in its optimized version in some open-source DDA codes. In this comment, we recall the different approaches (and related papers) addressing the computation of the Green function of a multilayered system. We show that they address all the points raised by Liu and McLeod in their paper and provide more efficient solutions to their computational issues.

中文翻译：

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对“使用离散偶极子近似快速准确地计算基底支撑超表面的电磁场”的评论

W. Liu 和 E. McLeod 撰写的题为“使用离散偶极近似 (DDA) 进行基底支撑超表面的快速准确电磁场计算”的文章提出了一种在存在基底或多层的情况下计算格林函数的方法。有效的方式。不幸的是，所提出的方法已为人所知二十多年，并且已得到显着改进。在一些开源DDA代码中可以找到它的优化版本。在这篇评论中，我们回顾了解决多层系统格林函数计算的不同方法（和相关论文）。我们表明他们解决了 Liu 和 McLeod 在论文中提出的所有观点，并为他们的计算问题提供了更有效的解决方案。