请问FDTD非线性仿真中，得到的谐波信号与电场的分量有关吗？

- October 25, 2023 at 11:12 am
  
  Cheng Chen
  Subscriber
  
  假设入射电场偏振方向在x方向，沿着z方向入射到一个包含非线性材料的纳米表面结构上。由于纳米表面结构的作用，近场的电场有三个分量，那么得到的谐波信号考虑了所有分量的贡献吗？还是只考虑了x方向的分量。
- October 26, 2023 at 5:35 am
  
  Chih-Hao Chen
  Ansys Employee
  
  FDTD 近場會考慮電場的所有分量不過需要確保monitor選項內 data to record裡面有勾選你想要觀察的分量
  - October 26, 2023 at 6:03 am
    
    Cheng Chen
    Subscriber
    
    请问在远场获取的谐波信号会考虑到所有分量的贡献吗？在官网案例second harmonic generation中，入射光为x偏振情况下，通过time monitor获取的谐波信息中只有Ex分量，这是否意味着远场只考虑了与入射光平行的分量的贡献？还是说由于这个案例中使用的是薄膜结构，近场也没有产生其他分量？以下是案例链接：Harmonic generation with a chi2 material – Ansys Optics
- October 30, 2023 at 1:14 am
  
  Chih-Hao Chen
  Ansys Employee
  
  我認為是你理解的這樣結構並未改變偏振所以x 偏振入射還是x偏振出射

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