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Eigenvalue missing imaginary part

Posted 13 juin 2016, 22:26 UTC−4 Version 3.5a, Version 5.1 0 Replies

Yingchun Qin
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Hi

I am trying to compute the Q factor of the whispering gallery mode in a silica sphere (10 um in diameter) with COMSOL 5.1. I am using weak form PED physics, and searching for eigenvalues. The Q factor is defined as Real(Eigenvalue)/(2*Imag(Eigenvalue)), the resulting surface plot makes sense but the related eigenvalue only gets real part.

What is really strange is that when build the model exactly the same with COMSOL 3.5, the eigenvalue comes with reasonable imaginary part . But when I run the model with COMSOL 5.1, again no imaginary part.

So what is going on there?

Thank you.
0 Replies Last Post 13 juin 2016, 22:26 UTC−4
COMSOL Moderator

Hello Yingchun Qin

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