Dear meep developers and users,
first, I would like to thank meep developers for their work on this
wonderful tool and the effort shown to get a Python interface, both in the
code and in the documentation. I think it is a big push to increase the use
of meep in electromagnetic simulations.
Second, I would like to ask a question I have not seen answered anywhere
(sorry in advance if it is somewhere I did not see). In short, I would like
to know if it is possible to modify a parameter of the material used in a
simulation continuously during the execution. More especifically, I would
like to change the gamma and fn parameters of the DrudeSusceptibility with
a step function, somehow in a similar way as change_sources function for
the sources.
I tried with a step function like:
def change_susc(sim):
t = meep.Simulation.meep_time(sim)
fn = t*0.2
susc = [meep.DrudeSusceptibility(frequency=fn,gamma=0.1, sigma=0.1)]
mat = meep.Medium(epsilon=1.0, E_susceptibilities=susc)
geom =
[meep.Sphere(radius=0.025,center=meep.Vector3(0,0,0),material=mat)]
sim.geometry=geom
meep.Simulation._init_structure(sim)
return sim
sim.run(meep.at_beginning(meep.output_epsilon), meep.at_time(10,change_mat),
meep.at_end(meep.output_epsilon),until=60)
The values are just for this example. Anyway, I must be doing something
wrong so I tried to simplify the problem with a material with no dispersion
and modifying the value of epsilon but again nothing happens.
At this point, I do not know if I am doing something wrong or it is just
that is not possible to change the material properties during simulation in
Meep. If someone could provide some suggestion I would be very grateful.
Thanks in advance.
Eduardo
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