FDTD 2D and 3D simulation results are too different

- April 7, 2022 at 1:52 am
  
  pengzheng97
  Subscriber
  
  I optimized a structure in 2D light field as follow
- April 7, 2022 at 3:23 pm
  
  Guilin Sun
  Ansys Employee
  
  I believe your waveguide structure has limited dimension in z. However, when you do 2D simulation, the software will assume there is no any variation, or confinement of the em fields. Basically it would be uniformly infinite in the 3rd dimension in 2D simulation. So they are not the same physical device.
  If you check the vector fields, you will see the difference.
  I would recommend you to us evarFDTD, which uses information in the 3rd dimension, yet the simulation is done is 2D, which is much fast and yet reasonable accuracy compared to 3D simulation.
- April 8, 2022 at 2:29 am
  
  pengzheng97
  Subscriber
  
  Thank you for answering my question.
  I have another question, is varFDTD MODE, can it be used in combination with 'LUMOPT' inverse design?
  Best wishes!
- April 8, 2022 at 3:51 am
  
  Guilin Sun
  Ansys Employee
  
  Yes, you can find examples here:
  https://support.lumerical.com/hc/en-us/articles/360042305314-Inverse-design-of-waveguide-crossing
  Inverse design of y-branch
  Please write a new post if you have questions not in the topic content.

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