Regular pyramid array in RCWA

- September 20, 2023 at 10:14 am
  
  Handon Um
  Subscriber
  
  When there exists distance between pyramid structure and RCWA boundary, the result shows reasonable reflectance.
  But, when the RCWA boundary get closes to the pyramid structure and there is no distance between them, the result shows larger than 1.
  I set the same number of relative inferfaces for each cases and the only difference between them is x,y span of RCWA.
  So I think accuracy is not a problem.
  How can I resolve the issue?
- September 20, 2023 at 10:35 pm
  
  Amrita Pati
  Ansys Employee
  
  Hi Handon,
  
  I would not expect both the structures to have the same response as the unit cell geometry is different in each case (for ex. the periodicity of the two geometries is different). But the second graph is clearly not accurate. It is possible that the structure needs more k-vectors to obtain convergence. I would ask you to increase the number of k-vectors (max number of ku and kv vectors in the Solver tab of RCWA) and see if you see any improvements.
  Regards,
  Amrita

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