Fu Malong, Zhao Yang
Opt Express. 2021 Aug 30;29(18):28954-28958. doi: 10.1364/OE.430766.
The Green's function is an auxiliary function that needs to satisfy different conditions according to the practical mathematical models applied to the problems. The required conditions do not have to be Helmholtz equation. Two possible common conditions are summarized in this reply, i.e., the Maxwell reciprocity and the corresponding homogeneous boundary conditions.
格林函数是一个辅助函数，它需要根据应用于问题的实际数学模型满足不同的条件。所需条件不一定是亥姆霍兹方程。本回复总结了两个可能的常见条件，即麦克斯韦互易性和相应的齐次边界条件。
