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This will depend on the working distances: you can definitely add such object in front to (attach to) the metalens, and use a monitor behind the metalens, and do the farfield projection to the focal plane, provided that you use plane wave source (with an iris/stop).
If there is an amplification, eg, the slab is located at some distance away from the metalens, it needs a lot of memory in order to directly image it. What you might do is:
simulate the slab with given illumination, and project the transmitted field on to the metalens front sourface (with small distance); then do the above simulation and post process the result.
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