二维仿真和三维仿真结果不同

- February 12, 2023 at 1:05 pm
  
  rui fang
  Subscriber
  
  请问一下为什么用二维仿真与三维仿真对同一结构进行仿真得到的结果不一样，结构图如下面所示
- February 13, 2023 at 5:22 pm
  
  Guilin Sun
  Ansys Employee
  
  参见 2D仿真和3D仿真对同一结构为什么结果不同
  中间是有小孔，两种情况不一样，2D认为是一条无限长的沟槽，不是小孔。
  - February 14, 2023 at 2:24 pm
    
    rui fang
    Subscriber
    
    谢谢，那请问下图一中的3d结构能够用2d去简化吗？如果可以的话，应该怎么去简化呢
- February 14, 2023 at 5:01 pm
  
  Guilin Sun
  Ansys Employee
  
  显然不能再简化。但是，我感觉还是有点问题，结构下面有基底吗？没有基底就是一个有很强谐振的腔体，仿真时间很长。你想简化是因为这个问题吗？
  - February 15, 2023 at 12:45 am
    
    rui fang
    Subscriber
    
    下面的话是有一个Si衬底，对，想简化的原因就是仿真时间比较长
- February 15, 2023 at 1:40 am
  
  Guilin Sun
  Ansys Employee
  
  红色材料下面还有基底吗？如果没有应该加上。如果用的是Background 材料，仿真时间长，应该是不能避免的，说明谐振比较强，或者是因为有的波长衍射角接近90度，请使用Steep Angle PML。请用光栅分析看看衍射角： Diffraction grating
  - March 13, 2023 at 12:32 pm
    
    rui fang
    Subscriber
    
    您好，请问下下面有个基底，厚度是几百um，但是其他层材料的厚度是几百nm，应该怎么设置仿真区域呢
- March 13, 2023 at 4:30 pm
  
  Guilin Sun
  Ansys Employee
  
  一般基底不用仿真如此厚，用PML截断，你可以做一次修正，仅仅将基底里面的反射透射率乘以基底下表面的菲涅尔反射损失，更严格的话把系统简化为不对称谐振腔，找教科书上的公式修正。这就需要每个面的菲涅尔系数。
  以后新问题请另外发帖。
  - March 14, 2023 at 8:42 am
    
    rui fang
    Subscriber
    
    好的，下次有新问题我重新发帖。用PML截断是设置基底厚度几微米，然后将仿真区域Zmin刚好设置到基底Zmin的位置吗？
- March 14, 2023 at 4:47 pm
  
  Guilin Sun
  Ansys Employee
  
  不对！半无限大结构应该穿透到PML之外，PML的作用是截断很大的物体。你看看网上的例子。

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