Just a couple points of clarification from my previous post:
1) In order to use 2 mirror symmetry planes in your ring structure,
you can use a minimum of 2 point/line sources (4 sources will also work).
2) The time average of the energy (or flux) can only be obtained if
you have time-harmonic complex fields which requires a CW source and not
a Gaussian as you are using.
On 12/02/2017 10:12 PM, Ardavan Oskooi wrote:
On 11/30/2017 02:21 PM, Da Silva, Jaime wrote:
I'm designing a large ring resonator (200µm diameter) in the visible
spectrum (640nm). My 2D simulations have been running for nearly 20h
(meep time 11,000) on HPC, using 12 nodes (36 cores/node). I believe
There are three things you can try to speed your computation.
1) Since the index contrast of your ring resonator is relatively
small, the Q of the resonant mode will likely also be small. Also,
regardless of whether the Q is small or not, harminv is still able to
resolve Qs of 1e6 given only a few periods of the field data (see
Section 5.2 and Fig. 9 of the Meep paper). This means that you don't
need to run your simulation for too long after the sources have turned
off for harminv to obtain an accurate result. You can facilitate
harminv's performance by using a narrow-band source as has been
discussed previously on this list.
2) Your ring structure has no sharp corners/edges (in 2d, at
least) and is a lossless dielectric (i.e., refractive index is purely
real). In this case, Meep's subpixel smoothing enables you to reduce
the resolution while still ensuring good accuracy.
3) Due to the four-fold symmetry of the ring structure, you can
use two mirror symmetry planes to reduce the size of the computation
by a factor of 4. To use this feature, you will need to use 4 separate
point/line sources. Note that both the structure and the
sources/fields must respect the symmetries that are defined. It might
be worthwhile to review this topic in the documentation
(http://meep.readthedocs.io/en/latest/Exploiting_Symmetry/).
Finally, if this may be relevant, you should be setting (set-param!
force-complex-fields? true) in order to obtain time-average values,
rather than snapshots, for the energy. This is because Meep uses real
fields by default.
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