Guilin Sun
Ansys Employee

Please post your result. I guess it is not the HE mode you expect. It is higher order. So please check the effective index and see if it is expected. You may need to use slightly larger reference index for the search.

As I said previously, there are a lot of PML modes that are not of our interest. The modal list only gives the propagation modes. Whether or not you can find the desired modes depends on the total number of PML modes and the max number of trial modes. If you use sufficiently large trial number you should be able to find that mode, if it exists.

The large number of trial modes definitely needs more computation time.