TAGGED: fdtd
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May 4, 2022 at 7:12 am
p21201100
Subscriber我在用案例metalens进行仿真时,为了我更好比较,我先用官网案例的设置去得出相位和透射率,之后我按照处理发散的帖子将相应选项改为stabilized后,从status上来看确实没有发散,但我得出的相位值和透射率的值和先前不改变设置的相位和透射率之间有差值,在这种情况下我该使用哪种PML设置,我这种比较方法是否正确,以及我该在什么情况下才改变设置,是只有出现发散后才可以进行发散设置吗?再次期待您的回答
May 4, 2022 at 5:29 pmGuilin Sun
Ansys Employee我很少用stabilized PML,应该是先找出发散的原因。如果材料色散很小,吸收几乎是零,我倒是建议用固定的折射率,比如SiO2,这个对结果不会有什么影响。超透镜仿真发散的主要原因应该是使用的光源不当,造成PML将光源截断后产生大角度衍射造成的,因此应该想办法才有合适的光源。网上的例子
https://support.lumerical.com/hc/en-us/articles/360042160473-Focusing-with-a-single-subwavelength-aperture
https://support.lumerical.com/hc/en-us/articles/360042160493
分别使用平面波和TFSF,都是确保衍射场不进入透镜和不产生很强的衍射。
所以,我建议你找一找发散的原因,只有针对发散原因采取的措施才是得当的,包括增加PML 的距离和层数,不一定使用stabilized PML,很可能其反射产生了后果。
参见
Ansys Insight: 修改PML哪些参数可以有效抑制FDTD发散
Ansys Insight: FDTD算法中pml的类型和选择
Ansys Insight: 如何放置PML,到底应该离开物体多远才合适?
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