FDTD软件中光源设置的单波长和带宽波长在同一波长处具有不同透射率的问题

- June 20, 2022 at 10:06 am
  
  656367950
  Subscriber
  
  我将光的波长范围设置成1.2~1.7um时，输出波导的透射率是这个样子（在1.7um时透射率为0.968）：
  
  但是当我只将它的波长范围设置成1.7um这一个点的时候，透射率会明显提高
  
  后面我又试了1.7~1.9um以及1.2~1.9um，结果也是1.7~1.9um的透射率会明显高一些，
  
  我想问一下造成这种现象的原因会是什么？还有这两种结果哪一种的置信度更高一些？
- June 20, 2022 at 3:30 pm
  
  Guilin Sun
  Ansys Employee
  
  主要两个原因:
  - June 21, 2022 at 2:00 am
    
    656367950
    Subscriber
    
    请问是哪两个原因呢？
- June 21, 2022 at 5:47 pm
  
  Guilin Sun
  Ansys Employee
  
  抱歉，每次贴图的时候，系统不让发走。这里中回复：
  主要是两个仿真的材料与网格不同，请：
  1：锁定网格波长范围：在FDTD/Advanced Settings/override simulation bandwidth for mesh generation
  2：锁定材料拟合的波长范围：在材料拟合“Show advanced”
  - June 23, 2022 at 2:19 am
    
    656367950
    Subscriber
    
    老师我根据您的方法试过了，但还是不行，请问还有什么其他原因吗？
- June 23, 2022 at 6:46 pm
  
  Guilin Sun
  Ansys Employee
  
  之前我有帖子并有测试结果确认这种方法可行。对于FDTD来说，结构确定后，只要材料核网格一样，应该能都得到一样的结果。参见这个帖子 Ansys Learning Forum

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