超透镜的设计

- November 30, 2022 at 1:33 am
  
  xingguohua18
  Subscriber
  
  老师您好，我想设计一个实现斜入射光束聚焦的超透镜，单个结构的周期为450nm，入射光波长为532nm，但因为斜入射单个结构存在零级和一级衍射光。请问在根据超透镜的目标相位去排列超构原子分布时，应该考虑的是FDTD计算的电场相位（所有衍射级次的电场叠加值）还是RCWA计算的单个衍射级次（0级）的相位？
- November 30, 2022 at 7:27 pm
  
  Guilin Sun
  Ansys Employee
  
  不管是用FDTD还是RCWA，都应该提取单个衍射级的相位，否则结果不正确，因为实际有用的透射是指定的衍射级来实现聚焦，当然高级衍射也可以实现聚焦，只是衍射角不同，衍射效率不同。
  有高级衍射的超透镜一般问题比较多，比如有旁瓣杂散光，所需要的透射率有点低等缺点。
- December 2, 2022 at 2:37 am
  
  xingguohua18
  Subscriber
  
  好的，谢谢老师，还想请教下老师，对于存在高级次衍射的情况，FDTD应该如何提取单个衍射级次的相位和振幅？
- December 2, 2022 at 11:11 pm
  
  Guilin Sun
  Ansys Employee
  
  单元仿真的分析组里可以指定想要的衍射级。超透镜就只能仿真整个透镜，计算焦面透射率时可以用窗口函数仅计算主光斑。

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