# Electric - magnetic field due to a dipole source

#1

Hi.
I am trying to get the electric and magnetic field in a location “r” due to the excitation of a dipole source at location “r_prime”. The desired wavelength range is from 10 um to 13.5 um. In fact, there are two thin film SiC layers with 100 nm and 10 nm thicknesses. They are separated by a vacuum gap of 100 nm. I want to put a dipole somewhere in SiC layer with thickness of 100 nm and get the electric and magnetic field in the middle of the vacuum gap between layers by setting a time monitor. In my opinion, electric and magnetic field should go to zero as simulation time increases. However, I cannot see such a thing in my case. I am curious why electric and magnetic field are not converging to zero in time domain?
If you open the file attached here, you can see that there is a time monitor in the middle of vacuum gap where I like to see electric and magnetic field as a function of time. Any idea on this is really appreciated. Thanks

Dipole.fsp (307.2 KB)

#2

Dear @psabbagh

You arr right and electromagnetic fields should go to zero over time as they get absorbed by PML layer.

Here is the screenshot of the results for your review:

and here is the modified simulation file:
Dipole_modified.fsp (248.2 KB)

Please let me know of your thoughts and I will be happy to be of a help.

Thanks

#3

Thanks a lot dear bkhanaliloo,
It helped me a lot. I have one more question, though. While I could converge the electric field at the target point, I could not converge it when the dipole is along the y axis. Is there any hint that I did not consider for dipole in y axis?! Thanks so much again.

#4

Dear @psabbagh