Hello, dear Meep users.
I am trying to use Meep to model a signal in a free space (i.e. with no
obstacles or any geometry objects at all).
I'm modeling a point signal with frequency = 1 with amplitude = 10 in a free
space (ε = 1).
Here's my simple ctl file:
(set! geometry-lattice (make lattice (size 20 20 20)))
(set! sources (list
(make source
(src (make continuous-src (frequency 1)))
(amplitude 10.0)
(component Ez)
(center 0 0 0))))
(set! pml-layers (list (make pml (thickness 1.0))))
(set! resolution 1)
(use-output-directory)
(run-until 122
(at-beginning output-epsilon)
(to-appended "ez" (at-every 1 output-efield-z)))
After modeling I'm trying to extract the images with the following command:
$ h5topng -z 10 -S4 -t 0:121 -R -Zc dkbluered -a yarg -A
./research-out/eps-000000.00.h5 ./research-out/ez.h5
But all the resulting images are completely black. I expect the images to show
the space propagation of my periodic signal.
I've found that I could get the non-black images if I add any geometry object
with ε being greater than 1 to the model, e.g. (make block (center 0 0 0) (size
1 1 1) (material (make medium (epsilon 1.01)))).
What am I doing wrong in the original model?
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