单波长扫描单元结构获取相位问题

- March 4, 2023 at 8:13 am
  
  kaixin123 cuicui12
  Subscriber
  
  老师，上图是我构建的单元结构，基底是二氧化硅，圆柱形硅纳米结构，我是固定高度，改变硅纳米柱的半径，扫描获取不同半径对应的不同相位值，我将采样点设置少一点（比如10个点），它的相位覆盖是在0到2π之间，但是如果设置到100或者200个点，它的相位覆盖就超过0到2π，有的甚至能达到十几，不知道是啥情况
  我设置的高度是0.6
  半径的扫描区间是0.04到0.2
- March 6, 2023 at 11:15 pm
  
  Guilin Sun
  Ansys Employee
  
  首先需要把基底Zmin向下延申到PML之外。
  10个点的时候可能漏掉了一些2PI变化。范围确定后可以选多的点，30个左右。你已经知道100点出现超范围结果，就不要扫描如此大的范围了，必要最小半径增加和最大半径减小等。
- March 8, 2023 at 9:18 am
  
  kaixin123 cuicui12
  Subscriber
  
  老师，我把扫描的最小半径增大了，然后又将光源，监视器的位置做了调整，然后用波长为1050纳米的平面波入射差不多最后的相位曲线覆盖到0到2π之间。然后我又测试了几个波长，我发现随着波长的增大，它的相位覆盖范围越来越少，还出现了负值，下图是我分别用1050纳米的平面波和1200纳米的平面波扫描后的相位覆盖曲线。这种随着波长增大，覆盖范围发生变化情况是正常情况吗？
  波长为1050纳米
  波长为1200纳米
- March 9, 2023 at 9:32 pm
  
  Guilin Sun
  Ansys Employee
  
  位相问题比较复杂，因为它是相对的，因此，起点不一样后面的结果就都不一样了。负的位相没有什么问题。
- March 10, 2023 at 1:28 am
  
  kaixin123 cuicui12
  Subscriber
  
  好的，谢谢老师

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