请问如何仿真周期结构（X、Y方向上无数个单元）的远场辐射？

- September 26, 2023 at 3:09 am
  Yawei Wu
  Subscriber
  设置中，FDTD范围只包含一个周期单元，X、Y方向的边界条件为周期性边界，Z方向为PML。光源为dipole，在周期结构内部，每个单元中有一个光源。
  1. scat_ff 和 ff_radiation_plot 应该怎么设置？几何范围和FDTD的范围一致吗？
  2. monitor可以通过用guassian spot 和增加x、y periods 仿真无限周期结构吗？
  3. 得到远场的电场数值后，想要分别计算左、右圆偏振分量，是直接用ExEy，还是需要转换为球坐标才更准确？（因为很多点并不在垂直出射的方向）
- September 26, 2023 at 5:49 pm
  
  Guilin Sun
  Ansys Employee
  
  A1: scat_ff 和 ff_radiation_plot 是为非周期结构设置的。如果是周期的，如果一定要计算散射，需要修改脚本，只留下Z方向的两个监视器，尺寸大于仿真区。
  ff_radiation_plot不适合周期结构。
  周期结构远场就是光栅衍射，不能使用这个分析组。
  A2：不可以。假设为周期只是近似查看，不能用作最后分析。
  A3：应该按衍射级，分别计算Ep和Es，而不是Ex,Ey Ez.
  请想一想你想要什么结果，什么是正确的分析方法。
  请参考
  Ansys Insight: 关于光栅衍射级及其计算
  Ansys Insight: 关于周期结构的远场图的问题
  Ansys Insight: 周期边界条件下如果希望计算有限周期的远场结果如何处理
  Ansys Insight: 周期结构结果：透射反射率、散射、远场、角分布、近距场分布、位相提取等综合帖

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