Hi, 

is there any multiwavelength grating optimization example available in your database? When I search for grating files, I found this example

https://support.zemax.com/hc/en-us/articles/1500005578722-Simulating-diffraction-efficiency-of-surface-relief-grating-using-the-RCWA-method

I am looking for step graded grating example optimized for two-wavelength simultaneously. Currently, I have a Trial License from Zemax. Here is some reference where people have tried this in the past. 

https://www.osapublishing.org/josaa/abstract.cfm?uri=josaa-23-1-193

Thanks in advance.