I am working with the FDTD Fluorescence Enhancement example here:
I am trying to reproduce the distance dependence on the radiative efficiency in the plot by the example paper above.
However, I am having trouble reproducing it. The example given in the application by lumerical has a 20nm sphere, but when I increase it to 30nm , and try to change distances between dipole and sphere, my results don’t seem to converge, as the results aren’t within the -dx, +dx theoretical range.
Even in the orignial setup, if I increase the mesh accuracy from 2.5 nm (original mesh size) to 1.25 nm while keeping everything else the same, the data does not converge.
Here is original data:
Here is same data with 1.25 nm mesh instead of 2.5 nm:
It’s already starting to get worse.
When I change the sphere to 30nm radius, and do dipole distance sweep (to coincide with the reference paper) with 1.25nm mesh , I no longer get my FDTD data in between -dx, +dx. For example 15nm distance:
All I am doing is changing the parameters in fluorescence_decay_setup.lsf . I am changing dipole distance, sphere size and I am using the transmission box since it’s finer mesh and I also want to eventually take the dipole closer to the sphere to see the dip in gammarad/gamarad0 as in the paper.
Any help would be greatly appreciated!