光源设置

- July 6, 2022 at 2:11 am
  
  huanyuan1806
  Subscriber
  
  请问fdtd仿真可以输入阵列光吗，就像达曼光栅获得的远场阵列分布光我设置成输入，就像下图这种阵列光从右到左合束
- July 6, 2022 at 4:34 pm
  
  Guilin Sun
  Ansys Employee
  
  图中看起来是阵列，但实际上每个点代表一个平面波或者准平面波，因为是在球面坐标下。
  原则上说可以有空间面阵列高斯光、模式光或者其它光，现在的问题是，每个单元的光波形状是什么？不可能是不同方向的平面波。即使你的结构是周期的，也不能用不同方向的平面波来激发，因为斜入射平面波仅对一个波长一个角度才能用Bloch周期性边界；或者一个角度下用BFAST宽谱。
  请再考虑一下光源形状和特性，给与具体详细描述，看看能否帮到你。
  - July 29, 2022 at 9:51 am
    
    huanyuan1806
    Subscriber
    
    老师，就是这种均匀的阵列光束，不知道老师有没有什么办法倒入fdtd呢
  - July 29, 2022 at 12:27 pm
    
    huanyuan1806
    Subscriber
    
    如下图是我用微纳结构获得的远场图，意思我是想将其作为输入，每束光的功率都是一致的
- July 29, 2022 at 9:49 am
  
  huanyuan1806
  Subscriber
  
  就是这种均匀分布的阵列光源，不知道老师有没有什么办法倒入fdtd呢
- July 29, 2022 at 3:26 pm
  
  Guilin Sun
  Ansys Employee
  
  如果你有每个“点”光源的场分布，可以将它们的场加起来作为自输入。参见 https://optics.ansys.com/hc/en-us/articles/360034383054-Using-an-equation-to-define-the-spatial-field-profile-of-a-source-in-FDTD

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