Analysis Failure when running FDTD bandstructure simulation

- July 25, 2024 at 1:56 am
  
  hany
  Subscriber
  
  Running bandstructure simulation with FDTD v2023.R2.1.
  When running bandstructure analysis, always get the following error:
  Error: prompt line 53: Unable to access data in unallocated matrix
  Error: Result spectrum: variable not found.
  fs(1:size_fs(1),1) = fs_detailed(:,1);
- July 30, 2024 at 7:36 pm
  
  Dev
  Ansys Employee
  
  Hello Hany,
  Aplologies for the delayed response. Please let me know which device are you testing and are you using FDTD?
  Share maximum information possible.
  Thanks and regards
  Devika
- July 30, 2024 at 9:20 pm
  
  hany
  Subscriber
  
  I am running bandstructure simulation on a waveguide grating using FDTD. I am using the bandstructure analysis solver provided in the FDTD. I use the default values for t_start and max_band.
  To me, it seems that the analysis code has been changed from 2020 version to now. In previous version, I don't see this t_start and max_band parameters in the analysis setting of bandstructure. And I cannot find anywhere in Lumerical's website about how these parameters should be set.