Question about the overlapping stitching in example Metalens

- January 4, 2023 at 6:41 am
  
  xuanlunhuang20
  Subscriber
  
  Recently, I'm studying the example Metalens, and I have a question about the stitching method in the script "stitch_nearfield_11um_lens.lsf".
  Why does it use overlap between the adjacent grid and apply weight 1/2 on the edge? Is it ok to use non-overlapping stitching?
- January 4, 2023 at 7:09 pm
  
  Guilin Sun
  Ansys Employee
  
  This is a genius yet approximate method, the same as the metalens. In metalens, the elements are simulated as infinitely periodic but in the metalens they are not. However their combination indeed functions as a lens. Plese read this section: Nearfield stitching and farfield projection. This method tries to save simulation time, in particular for very large dimension.
  As you can see, when stiching the near fields, they are not continuous.
  As for the overlap and edge weighting, I guess it is a kind of compensation. You can try to not overlap and see if the result can be better or worse.

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