Although the device seems simple the simulations might not be that intuitive. For example, you need to use exactly the same fitted material, place the dipoles in their correspodent E field components:
Please refer to this example https://optics.ansys.com/hc/en-us/articles/360042161033-Fluorescence-enhancement
There is an example for coparison:
https://optics.ansys.com/hc/en-us/articles/360042713433-FDTD-vs-stackdipole-halfspace-emission-in-a-multilayer-stack
Please also refer this example: https://optics.ansys.com/hc/en-us/articles/360041612594-Purcell-factor-of-a-microdisk
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