I guess you know how to get the eigen vector: https://optics.ansys.com/hc/en-us/articles/360034925793-eig-Script-command
You will need to get the eigen vector in an analysis group; in "model"; or in Custom FOM if possible:
https://optics.ansys.com/hc/en-us/articles/360034922953-Optimization-utility
examples:
Inverse design of y-branch
Inverse design of waveguide crossing
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