How purcell factor changes with the wavelength and different orientation of the dipole ? the trend results given by lumerical are very random? IS there any mathematical relation?

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The above are the results i got various dipole orientations. But i do not understand the trend.

Hello @sushmagali,

The Purcell factor is related to the fact that the total power emitted by a dipole source will depend on its surrounding environment. This topic is discussed in more detail on this page:

In particular this note near the bottom of the page discusses the question of how a dipole’s environment changes the emitted power:

I am not sure how exactly the Purcell factor is affected by the dipole orientation and wavelength in the case of your simulation, but this is in general what determines the Purcell factor.

I hope this helps. Let me know if you have any questions.

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