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Hi Jordi,
That's a great point. It is likely that with the increased amplitude the color bar changes in such a way that it incorrectly looks like the mode is not confined. I ran some test simulations and I see similar behavior as well. For amplitudes of 1 and 10^3, I ran three simulations. The first is just a simple simulation with an amplitude of 1, and the second with an amplitude of 10^3. In the third, also for an amplitude of 10^3, I recorded the intensity data scaled by 10^6.Â
The recordings in the first and the last case look almost identical. I tried uploading some gifs but their size is too large to be accepted here. So, I think the issue is because of the range of values in the color bar, and not the confinement itself. But I am not sure if this simple scaling would work in all cases, espcially in nonlinear simulations. I will spend some more time on this or maybe get some insights from my colleagues and get back to you with more information. In the mean time, what happens when you scale the data for your movie monitor?
Regards,
Amrita