Hi Naveen,
It looks to me like you're placing the monitor exactly where you are injecting the source. I think you should place it a few mesh cells in front of the source, as it takes a few mesh cells for the source to be injected (shown grey area around the source). Or you may try a "port" instead (of mode soruce+monitor) and see the T result from there. In general surface roughness is tricky to simulate. As you mentioned, it takes finer mesh to resolve some of the features otherwise we lose accuracy. Unless you have symmetry, I don't think there is a lot more we can do to reduce the simulation time. You can downsample some of the monitor data to save some time/memory, but I don't think it will make a large difference. Would you be able to share a screenshot of the overall simulation geometry? On your last question: yes, you can do it with import source. Here is an example: Using monitor data to define the spatial field profile of a source in FDTD. Using an import source requires some additional considerations to limit the amount of source injection errors, for ex. making sure that the location of the monitor in the 1st simulation and the 2nd import source in the 2nd simulation are at the exact same location. We also recommend using the same mesh (at the location of monitor in the 1st simulation and source in the 2nd simulation) to avoid any aritificial reflections when you inject the source. Also, it is recommended to turn off interpolation in the monitor (whose data will be used in the 2nd simulation) of the 1st simulation to reduce interpolation error.
Regards,
Amrita
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