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Photonics – Chinese

Photonics – Chinese

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  3. 请问FDTD仿真中的光脉冲为何在真空传播中衰减？

请问FDTD仿真中的光脉冲为何在真空传播中衰减？

    • March 15, 2024 at 3:06 pm
      Newbee Li
      Subscriber

    • March 15, 2024 at 3:47 pm
      Guilin Sun
      Ansys Employee

       

      这应该不是衰减，而是因为一：脉冲很短；二：发散角太大场分散了。你长脉冲或用频域监视器在这个平面再看看。

      如果下面有结构可以先Disable。你也可以加水平监视器做远场投射看看发散角，要注意查看监视器边缘的场是否几乎小到零，否则远场投射不准，出现波纹。

       

    • March 15, 2024 at 4:41 pm
      Newbee Li
      Subscriber

       

      十分感谢，应该确实是发散。

      我想再请教一个问题：如下图一左一右两块相同的材料，除右侧一块较宽外其余基本相同，但光在右侧材料上的反射率高很多，这是为什么呢？

       

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