I have two questions regarding the fitting in var FDTD.
- Please have a look of the following lms files.
The only difference between case1 and case2 in the above zip files is the imaginary weight, which is 10,000 in case 1 and 100,000 in case 2. I have checked and found out that it does not influence the fitting curve at every component, but the results from the two files differ a lot.Below are the results of optical power before and after passing through the ring (obtained from the “before” and “after” monitors), and we can see that the transmission is much lower in latter case, which is unreasonable.
So just wan to know what is the reason for that phenomenon, and which part should we check before running the simulation to prevent simulation situations happening again?
- Please have a look of the following input files.
The structures and the mesh point for the core material are exactly the same in those two cases. However, one of them fits the core material with a straight line, as expected. But the other’s (trial3) data point on the core material imaginary part fitting has a weird curve behavior shown below. Therefore no matter what I do to adjust the fit, it will always mimic the curve.
Again, what is the reason for the phenomenon and how do we treat it?
Just post here to let me know if additional information is needed.