negative Q values, and very high dQ definitely mean something is wrong. Depending on which method (findresonance or fft) please check some settings, like simulation time, time sginals. If it is fft method, the time section might not be proper to collect the resonance. Please check the analysis script in the group, and plot some intermediate results for diagnosing the issues.
Since FDTD is a time domain method, most of the time we use broadband source. However you can limit the frequency-domain monitor to record specified wavelength or wavelength range. Time monitor picks up signals traveling back and forth, which can be used to extract resonance information.
You can inject a pulse centered at the desired wavelength in source settings:
Please submit future posts in the Photonics Forum.
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