You can get the Purcell factor from the dipole source, which is dipower_radiated_power/source_power_in_homogeneuous_material
source_power_in_homogeneuous_material can be obtained by sourcepower:
sourcepower - Script command
dipolepower - Script command
Understanding dipoles in non-homogeneous materials
Purcell factor of a microdisk
You can also get the radiation spectrum from the point time monitor.
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