平面波倾斜入射能用于对称和反对称边界条件吗？

- September 18, 2022 at 10:16 am
  
  pengrenjuddd
  Subscriber
  
  对于一个周期结构（如光栅），采用倾斜的平面波入射，请问FDTD的边界条件能否用对称（symmetric BCs）和反对称（anti-symmetric BCs）?能否得到与Bloch边界条件一致的结果？
- September 19, 2022 at 5:34 pm
  
  Guilin Sun
  Ansys Employee
  
  没有入射角的那个面还可以用对称（symmetric BCs）和反对称（anti-symmetric BCs），有入射角的面必须用Bloch,如果是单波长的话。如果用BFAST，它有自带的边界条件，只是没有入射角的一面仍然可以用对称（symmetric BCs）和反对称（anti-symmetric BCs）。
  只有有入射角的面才有特殊要求。
  如果有入射角的面用对称（symmetric BCs）和反对称（anti-symmetric BCs），那就错了！

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