Could you share the optimization progress, and compare this with the performance of the unoptimized device? I don't understand how the device could have worse performance then the initial design? The optimizer could certainly get stuck in a local minima, but perhaps starting from your best candidate then proceeding with lumopt at the both temperatures could help?
Also how are you assigning the defining the device and background index via python. Could you share some code snippets? Are you using varFDTD?
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