Hi,
I'm simulating a metalens, and I want to know the field behind the lens surface. If I just calculate the field of whole space, I would run out of memory. So is there any technics, through which I can get the field at some point behind the lens without solving every point in the mesh? I mean, is it possible that I can get the farfield through the nearfield just behind the lens, without solving the Maxwell equation?
Thanks.