YouÒÇÇare using varFDTD, which simplifies the 3D simulation. When you got the first optimized result, it is 2D (3D collapses to 3D, and uses 3rd dimension confinement). However, if you import the result again to varFDTD, it recalculates the effective index via the varFDTD algorithm: Ansys Insight: MODE ÕêØÕ¡ªÞÇà´╝ÜÕà│õ║ÄvarFDTDþÜäÕÀÑõ¢£ÕÄƒþÉåÚù«Úóÿ which might not be correct.
As I mentioned previously, if you do not trust the first optimization result, you should modify it instead of re-optimize it again. The second optimization means that the first result is not good, violates the optimization in the first run! I do not see any reason to do the 2nd optization using varFDDT or 2D FDTD. You may try 3D FDTD.
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