On 5/21/19 05:09, ei ru wrote:
In my simulation, the pml overlapping the left-handed material does
not work.
The wave is not absorbed but growing.
I use drude-conductivity for mu and epsilon to make negative
refractive index.
The field divergence for a negative-index material everywhere that you
are observing is described in an FAQ
<https://meep.readthedocs.io/en/latest/FAQ/#why-does-my-simulation-diverge-if-0>:
"If you have negative ε/and/negative μ/everywhere/, the case of a
negative-index material, then the simulation is fine. However at the
boundary between negative- and positive-index materials, you will
encounter instabilities: because of the way Maxwell's equations are
discretized in FDTD, the ε and μ are discretized on different spatial
grids, so you will get a half-pixel or so of εμ < 0 at the boundary
between negative and positive indices, which will cause the simulation
to diverge. But of course, any physical negative-index metamaterial also
involves dispersion."
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