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March 13, 2022 at 11:12 am
Rabi4_
SubscriberMarch 18, 2022 at 1:56 pmGreg Baethge
Ansys Employee
A first consideration is the mode solver area is too small. You need to increase its span. Typically, we want the mode fields to be negligible at the boundaries so the boundaries are not affecting the modes.
In any case, we'd probably need more information about your simulation settings.
March 18, 2022 at 2:23 pmMarch 18, 2022 at 2:23 pmRabi4_
Subscriber
March 18, 2022 at 2:23 pmRabi4_
SubscriberI am using the FDTD solver. I used the 2D simulation and in the mode source I used the Fundamental TE mode
March 18, 2022 at 3:10 pmGreg Baethge
Ansys EmployeeThanks for the additional information. I think an issue is how is defined TE and TM in a 2D simulation. If you look at the modes calculated by the source ("mode selection" set to "user select"):
You can see here that TE is defined as y polarized, that is not necessarily the definition if you consider the propagation in a slab in the xz plane. So the question is to make sure you're looking at the right modes.
March 18, 2022 at 3:23 pmMarch 18, 2022 at 3:33 pmRabi4_
SubscriberAnother observation: I can get the TE Mode as the fundamental mode when I increased the waveguide width to 500nm. However, in 220nm, I don't get the same result? WhY?
March 21, 2022 at 1:57 pmGreg Baethge
Ansys Employee
As I mentioned, the first thing is to make sure you have the same definition for TE and TM modes. With the convention we use for 2D simulations, with a source propagating along the x axis, TE is polarized along y and TM along z.
Then, whether the fundamental mode is TE or TM is dependent on the waveguide dimensions. I don't think there's anything wrong with the modes that are found.
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