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Guilin Sun
Ansys Employee

首先,基底应该向下延申超过PML,否则形成谐振腔导致需要长的仿真时间。

其次,你需要监查单元仿真时是否有高级衍射。

还有,当使用平面波做光源但是用PML做比较条件时,横向的PML应该远离超透镜部分,否则PML截断平面波产生的衍射光以不同角度进入超透镜,导致光斑大且可能出现你现在的问题。https://optics.ansys.com/hc/en-us/articles/360034382874-Understanding-field-truncation-issues-with-finite-sized-plane-wave-sources

最后,你的实际位相与目标位相差别较大,你看看网上例子

你能得到有聚焦效果已经不错了。

https://optics.ansys.com/hc/en-us/articles/360042097313-Small-Scale-Metalens-Field-Propagation