I do not believe that you can still use geometric optics concept to define the imaging process when at the wavelenght scale. In such case how do you define the focal plane? The axial max intensity may not be the geometric focal point.
I would strongly suggest you to do two simulations 4 steps:
step1: object +plane wave
step 2: propagate the fields to in front of the lens
step 3: simulate the lens with import source
step 4: propagate the fields to the image plane as suggested previously
When one more lens is invloved, do the same thing.
If geometric optics works you do not need to simulate it with FDTD.
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