Hi everyone,
I am simulating a ring resonator in lumerical FDTD. It has reached the autoshutoff threshold ( result view status:2) before completing the simulation time ( simulation has done upto 54%). Then the simulation stopped and showed me some results.
1.Is it showing the accurate result without completing the simulation time?
2. Is it possible to ensure that all the light couple into the resonator upto 56% of simulation?
3. If it's inaccurate, how can I solve this problem?
Anyone has faced this type of problem in FDTD?
Your response will be highly appreciated.
Thanks.
Hello!
is your a matlab code or a different software?
Let us know more.
Fabio
Hi @ Fabio Viola,
It's already mentioned in the question. I am using FDTD product from Lumerical software.
To be on the safe side, I would repeat the calculation with an autoshutoff threshold set to one order of magnitude lower as before, up to the point where you see no more changes in the results.
Dear
1.Is it showing the accurate result without completing the simulation time?
-> It was sufficiently accurate (except for the special case. In my case, the 2D material simulation shows some weird result)
2. Is it possible to ensure that all the light coupled into the resonator up to 56% of the simulation?
-> I don't understand this question (I don't know the exact situation)
3. If it's inaccurate, how can I solve this problem?
-> You can decrease auto shutoff time. Sometimes it is important to decrease it (such as 10^-5 -> 10^-7)
Thank you for your valuable feedback. I decreased the autoshutoff threshold level by 10^(-6) and the results remained same.
I misunderstood your 2nd question
If you mean couple -> whispering -> light out, the answer is yes
Since FDTD uses pulse as a light source, you can observe in the time-domain by using the "Movie" monitor. Using this, you can ensure that how the phenomenon happens and it is really terminated
I think most people have answered this, but I would like to add that typically reaching the autoshutoff before the simulation time has finished is desirable. The autoshutoff is designed to end the simulation when the energy left in the simulation environment is negligible. The cavet being, as others have mentioned, if your autoshutoff is too high for the particular phenomenon you are tying to observe. However, it sounds like, because there is no noticeable change to your results when reducing the autoshutoff, you can safely assume that the autoshutoff was selected correctly.
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