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Dear all,

I've set up a first rough approach for calculating the optical eigenmodes of a dielectric disc on a substrate. The problem is, that even though I ask comsol to look for 20 eigenfrequencies around a certain frequency, it will always only calculate one. The same happens if I account for symmetry and cut my design in quarters together with adding perfectly magnetic conductors. I am confused since I would have expected to find many parasitic solutions which live within my substrate or pml layers but to find only one which is off from the expected values by three orders of magnitude.
Did someone maybe experience the same issue in the past or has some hints for me how I can improve the study?

Best regards,
Philip Heringlake