On Jun 16, 2009, at 1:00 PM, Jing Ouyang wrote:
I put a point source at the center of the cavity, which is also the
origin.
If I am using Ey gaussian source excitation,
I guess the maximum symmetry is:
(set! symmetries (list
(make mirror-sym (direction Y) (phase -1))
(make mirror-sym (direction X) (phase 1))
(make mirror-sym (direction Z) (phase 1))
))
If I am using Hz gaussian source excitation,
the maximum symmetry is:
(set! symmetries (list
(make mirror-sym (direction Y) (phase -1))
(make mirror-sym (direction X) (phase -1))
(make mirror-sym (direction Z) (phase 1))
))
The mode should have both Ey and Hz components,
but the symmetries are different for Ey and Hz.
An Ey source at the origin will produce an Hz field at most points in
space, but the Hz field at the origin will be zero, precisely because
a nonzero Hz field at the origin would have a different symmetry than
an Ey field at the origin as you described.
Similarly, an Hz source at the origin will produce an Ey field at most
points in space, but the Ey field at the origin will be zero by
symmetry.
Steven
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