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Ethan Keeler
Ansys Employee

Hi Yuqi,

Apologies for the delay! It's hard to say exactly what level of power could be contributed by the PML reflections. You could also try understanding what's happening near the PML boundary by placing a point time monitor nearby to see if the fields are circulating for some time.

If you are finding reflections or want to do a bit of convergence testing, I was thinking you could try increasing the number of PML layers to see if that impacts the resonating energy. You can read more about parameter selection for the PML boundaries here: PML boundary conditions in FDTD and MODE – Ansys Optics.

Ethan