Reply To: Metasurface FDTD:reflectivity and transmittance is greater than 1 and big noise

[Kirill]

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