关于光源的频域和时域

- April 4, 2023 at 4:01 am
  
  2212296
  Subscriber
  
  gua
  
  大家好
  我在进行仿真的时候注意到：光源的选择，如图所示。据我所知lumercal fdtd只能进行时域求解。那么
  为什么会有 set frequency 和 set time domain 两个选择。按照往常所默认的会选择set frequwncy,但是今天注意到了还有time domain。请问我该如何设置？
- April 4, 2023 at 7:13 pm
  
  Guilin Sun
  Ansys Employee
  
  不清楚的话就用缺省设置，除非你清楚知道为什么不用缺省默认设置。
  FDTD是时间域算法，Lumerical的方法是通过傅里叶变换得到频域结构，因为频域结果才是绝大多数用户需要的。
  参见
  Ansys Insight: 关于光源的归化问题：频谱和功率
  Ansys Insight: 为什么说仿真时间要足够长才能得到正确的频域结果
  Ansys Insight: FDTD 初学者： transmission函数的使用、透射率反射率正负号问题
  时间域光源设置一般是有特殊目的，比如一定要设置单频率（主要是个别非线性仿真需要），或者需改频谱分布等，一般不需要再时间域设置光源参数。

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