关于一维光栅在平行光入射下的不同空间位置的反射率

- May 26, 2022 at 9:15 am
  
  BIT_ZXB
  Subscriber
  
  老师好，目前我想利用FDTD仿真一维光栅结构在固定入射光条件下的色散作用，示意图如图
  
  具体来说，是想得到在光栅上方的固定平面的不同位置的反射率。目前的模型如下图，
  
  平行光45°入射，边界条件都用了PML，监视器用了很小的面监视器，想遍布距离光栅平面固定高度平面的各个位置，现在的问题是，仿真不收敛，并且我并不知道这样的模型设置是否正确，提前感谢老师的回复！
- May 26, 2022 at 3:38 pm
  
  Guilin Sun
  Ansys Employee
  
  不收敛也不奇怪，因为平面波被PML截断产生大角度衍射。Understanding field truncation issues with finite sized plane wave sources 这个光栅是只有几个齿，还是很多，可以看作无限周期？如果是只有几个，可以用PML加TFSF光源，可以直接用监视器获得近场；如果是很多，应该用平面波+Bloch边界仿真单波长，或者用BFAST仿真宽谱，然后用光栅分析获得不同衍射角下的远场，再将远场构造为近场，例子参见 Photolithographic projection to photoresist 只需要了解第一步过程和构造近场即可。再有问题请另外单独发帖。

Viewing 1 reply thread

You must be logged in to reply to this topic.

Ansys Innovation Space

Boost Ansys Fluent Simulations with AWS

Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.

Earth Rescue – An Ansys Online Series

The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.

Ansys Blog

Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.

Trending discussions