FDTD仿真计算波导到空气中的发散角

- May 30, 2023 at 12:08 pm
  
  tlyeer
  Subscriber
  
  老师你好，我想在FDTD中仿真计算光从taper波导到空气中的光发散角度，这个如何计算，是直接看在空气中垂直于波导的监视器的farfield图吗？
  上图为所说的监视器的光场的farfield图，这个图是否可以说明发散角为20°？
- May 30, 2023 at 4:48 pm
  
  Guilin Sun
  Ansys Employee
  
  是的，应该看空气中垂直于波导的监视器的farfield图，因为远场计算需要监视器在均匀介质中。
  这个远场两个方向发散角不一样大。因为强度是连续的，如何定义此时的角度需要自己考虑，是强度下降到e-2还是0.5还是其它数值，你要做决断。
  计算一个方向发散角的例子参见
  Ansys Insight: 在远场图中找光强最大点对应的角度时遇到一些问题

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