Reply To: light source blockage in Lumerical

[Guilin Sun]

I am not sure what is the object distance. If it makes the simulation too large, you may do this in 3 steps:

1: using the source and the obstacle to do the first simulation, project the monitor data on to the front of the metalens, using farfield3D, including E and H:

https://optics.ansys.com/hc/en-us/articles/360034930733-farfieldexact3d-Script-command

2: using the projected EH data as import source, simulating the metalens. Using monitor data to define the spatial field profile of a source in FDTD

3: project the monitor data on to the inmage plane.

the two simulation files should be small, compared to simulate the whole process from object (the obstacle) to the image plane.