According to Zemax’s online help https://support.zemax.com/hc/en-us/articles/1500005578722-Simulating-diffraction-efficiency-of-surface-relief-grating-using-the-RCWA-method, for the particular diffraction grating that we are trying to model, we need to increase the Max Order parameter.
In the help on “simulating diffraction efficiency of a surface relief grating using the RCWA method” authored by Michael Cheng and updated on April 28, 2023 under the subsection Max Order it is stated
“This is currently limited to 10 (totally 21 harmonics). When the number is larger than 10, it’s modified to 10 in the DLL. Contact support team to increase the limitation.”
What is the procedure to increase the limitation?