Hi Amrita
Thank you for your response.
The bottom line is we can't see it yet.
When I used zemax, I could only see a certain diffraction light with the diffract order function, so I thought it would be possible in lumerical fdtd
so I'll be waiting for your information.. 
Or can I input the zbf file I extracted through simulation into zemax to simulate only a specific diffracted light POP?
What I want finally is to design an imaging optical system with my zone plate. So I want to delete all zero-order diffraction
If simulation is possible with zemax, it is good news, but there is one problem. I extracted the zbf file through lumerical fdtd, but I don't know how to import the zbf into the zemax lens data or other place.
I'd appreciate it if you could answer.