DBR反射镜

- May 2, 2022 at 1:50 pm
  
  HaoHAO
  Subscriber
  
  我用的bragg grating作为dbr反射镜，每一层介质的厚度都是都是根据中心波长（535nm）的四分之一设置的，但是用监视器看在中心波长处的反射率非常低，请问是为什么
- May 2, 2022 at 6:21 pm
  
  Guilin Sun
  Ansys Employee
  
  原因很多。
  如果你的Grating宽度太小，理论预测可能很差，根据你的结果，R+T远小于1 ，这些功率不是被吸收就是被散射了。你可以加BOX监视器，也就是３D情况下用六个面监视器看看总的透射率与１　差多少？如果非常接近１，那就是散射、吸收了，需要改进你的设计。
  此外，也许这个器件Q很大，你的监视器只有5个频率点，很可能就漏掉了极大值，请增加频率点数，例如51个点测试看看。
  BOX监视器分析组参见
  其使用参加散射例子：https://support.lumerical.com/hc/en-us/articles/360042703433-Mie-scattering-FDTD-

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