请问一下FDTD仿真单缝衍射的问题

- August 18, 2023 at 2:41 am
  
  Yi Yang
  Subscriber
  
  如图这是我设计的单缝，缝宽600nm，
  
  在300um位置处放置监视器，运行了接近1个小时，得到的电场如下图，不知道哪里出了问题
  
  希望大佬指点迷津，感谢
- August 18, 2023 at 2:45 am
  
  Yi Yang
  Subscriber
  
  这是y
- August 18, 2023 at 2:47 am
  
  Yi Yang
  Subscriber
  
  补充一下，这是运行结果的电场图
- August 18, 2023 at 5:31 pm
  
  Guilin Sun
  Ansys Employee
  
  可能有两个问题：
  1：仿真设置：无限长狭缝还是有限限长？无限长用2D即可，有限长需要将长度包括进去。目前的光源仅照明一部分狭缝，用的好像是平面波，PML边界。此时PML将平面波截断产生一次衍射。
  请斟酌要仿真什么样的狭缝，如何设置。需要时间思考。
  2: 300微米远监视器没有监测到数据，说明光信号根本没有传播到这里。大量的时间是因为内存需要太大造成的。因为狭缝后面没有其它微结构，不要如此仿真，而是仿真很短距离，然后用farfieldexact 计算任意距离上的场分布。参见
  Ansys Insight: 关于farfieldexact及其应用
  - August 20, 2023 at 12:43 pm
    
    Yi Yang
    Subscriber
    
    谢谢你的解答，我的目的其实就是想要仿真简单的单缝的夫琅禾费衍射，因此仿真了很长距离
  - August 20, 2023 at 12:49 pm
    
    Yi Yang
    Subscriber
    
    那为什么光信号没传到这里呢
  - August 20, 2023 at 4:13 pm
    
    Yi Yang
    Subscriber
    
    老师，我想再问一个问题，如果我要求一个周期结构（500nm小球的阵列）在10cm处的衍射图样，我可以直接用farfieldexact3d函数吗，还是说需要先求角分布再求实空间的分布呢？感谢老师回复！
- August 21, 2023 at 2:41 pm
  
  Guilin Sun
  Ansys Employee
  
  仿真时间太短；脉冲是一个一个网格向前走的。
  周期结构不可以用Far field系列脚本，那是为非周期结构准备的。
  周期结构一个先做光栅分析，结果在1米远球面上；再通过位相修正再指定平面上不同衍射级叠加，参见
  https://optics.ansys.com/hc/en-us/articles/360041781874-Photolithographic-projection-to-photoresist
  此方面再有问题请另外发新帖。
  - August 23, 2023 at 9:23 am
    
    Yi Yang
    Subscriber
    
    谢谢

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