用简单的fft脚本计算场的横向波数时，得到的结果与理论计算的相反，这是什么原因？

- February 16, 2022 at 1:22 am
  
  czt
  Subscriber
- February 16, 2022 at 4:55 pm
  
  Guilin Sun
  Ansys Employee
  
  与理论是一致的，因为Lumerical使用的是工程定义，exp(j*k*r），角度为负，波数就是负的。正负号无关紧要，因为定义可能不一样。
- February 17, 2022 at 2:05 am
  
  czt
  Subscriber
  
  好的，感谢老师的解答

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