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Ansys Learning Forum › Forums › Discuss Simulation › Photonics › Metasurface FDTD:reflectivity and transmittance is greater than 1 and big noise › Reply To: Metasurface FDTD:reflectivity and transmittance is greater than 1 and big noise

December 3, 2024 at 12:46 am
Kirill
Forum Moderator

Dear Subscriber,

Your results resemble an undersampled Fabry-Perot cavity with noise. Here are some recommendations to improve your simulation:

  1. Increase the number of frequency points in your monitor to better resolve oscillations.
  2. Refer to the article Transmission Results Greater Than One – Ansys Optics. Increase the simulation time, ensure the simulation status equals 2 (indicating it ended by reaching the autoshutoff level), and verify that reflections from PML layers are negligible.
  3. Perform convergence testing. Follow the Convergence testing process for FDTD simulations – Ansys Optics to minimize numerical errors and achieve reliable results.

Best regards,
Kirill