Learning Forum

[Guilin Sun]

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.