You could try using a coordinate transformation to simulate a non-uniform
resolution, to increase resolution in your metal layer:
https://meep.readthedocs.io/en/latest/FAQ/#does-meep-support-grids-with-non-uniform-discretization
<https://meep.readthedocs.io/en/latest/FAQ/#does-meep-support-grids-with-non-uniform-discretization>
Plasmonic effects are pretty challenging for FDTD because of the resolution
requirements, in general — I often switch to finite-element or boundary-element
methods in that case.
> On Nov 26, 2020, at 7:22 AM, Juan Ramón D <deop...@hotmail.com> wrote:
>
> Dear meep users,
>
> I am trying to simulate the reflectance spectrum of a Stacked complementary
> “Plasmo – Photonic cristal” as described in the following paper:
> https://pubs.acs.org/doi/10.1021/nl504755d
> <https://pubs.acs.org/doi/10.1021/nl504755d>.
> I am using a cell of size 0.4 x 0.7 x 12 (microns).
> I have managed to get acceptable results with a resolution of 200 points
> /micron.
> However, the results are not fully converged (there is a thin 42nm gold layer
> which might be causing trouble).
> When I try to use a higher resolution, e.g. 250 points/micron, my code stops
> after defining the geometry:
> mpirun noticed that process rank 8 with PID ---- on node ------ exited on
> signal 9 (Killed).
> I think this is a problem of RAM because it only happens for big cells / high
> resolutions
> I have used a computer with 32Gb RAM and the amazon cluster, instance
> c4.4xlarge with the same result.
> I want to try with 64Gb amazon cluster instance, but anyway it won’t be
> posible to increase too much the resolution, because the RAM memory depends
> on res^3.
>
> Is there any way I can reduce the RAM usage for such a simulation, to get a
> higher resolution? Could it be because of a different reason?
> I can only think of reducing the cell (PML layers) and using non-dispersive
> models for the materials, but both methods compromise the results of my
> simulation.
>
> Thank you very much.
>
> Best regards,
> Juan.
>
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