这种图片怎么复现出来？

- August 19, 2023 at 11:54 am
  
  pengliang lei
  Subscriber
- August 21, 2023 at 8:48 pm
  
  Guilin Sun
  Ansys Employee
  
  不知道啊，其它信息都没有，就两幅图。你好好看看这个文章吧，看看里面怎么说。
- August 24, 2023 at 1:13 pm
  
  pengliang lei
  Subscriber
  
  论文中就是给了一个θ=arg（tr）。tr是透射系数，论文中提到有T=|tr|^2，但是我找了很久FDTD的仿真只有T而没有tr。其中的group index则是慢光器件的群折射率，phase shift则是透射相移。
- August 24, 2023 at 3:26 pm
  
  Guilin Sun
  Ansys Employee
  
  tr是振幅透射系数，基本上就是场分量（需要做折射率修正，参考菲涅尔系数章节了解其物理原理）。
  如果你只想找到位相，可以参考超透镜例子或者超材料例子：
  https://optics.ansys.com/hc/en-us/articles/360042097313-Small-Scale-Metalens-Field-Propagation
  https://optics.ansys.com/hc/en-us/articles/360042097393-Metamaterial-parameter-extraction-Smith
- August 24, 2023 at 3:29 pm
  
  pengliang lei
  Subscriber
  
  好的，谢谢了

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