For a 2d cell, you need to set force_all_components=True in the
Simulation constructor.
Note, however, that the GaussianBeamSource is only strictly valid in 3d.
As described in the manual
<https://meep.readthedocs.io/en/latest/Python_User_Interface/#gaussianbeamsource>:
"In 3d, we use a"complex point-source" method
<https://doi.org/10.1364/JOSAA.16.001381>to define a source that
generates an exact Gaussian-beam solution. In 2d, we currently use the
simple approximation of taking a cross-section of the 3d beam. In both
cases, the beam is most accurate near the source's center frequency."
See: https://github.com/NanoComp/meep/issues/1308.
On 11/10/20 04:42, Ian Sage wrote:
If I set beam_E0=mp.Vector3(1,0,0) or beam_E0=mp.Vector3(0,0,1) it
works fine, but if E0 is set to any other direction such as
beam_E0=mp.Vector3(1,0,1) or beam_E0=mp.Vector3(1j,0,1) then I end up
with fields of zero. Normalizing |E0| to 1 doesn't help.
Is there any way to generate a circular polarized Gaussian beam in 2d?
(it's possible with a simulated QWP, of course)
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