On Sun, 3 Dec 2006, Sung Park LEE wrote:
I decrease the radius of the nearest-neighbor hole (6 holes) around
the single point defect cavity in PC slab (triangular lattice of holes).
After making the structure, I applied the Hz source to get the resonant
frequencies, and mode symmetries (monopole, dipole, quadrupole, and
hexapole mode). Now, I have two questions would like to ask you:
First: What is position of Hz source?
Do you mean, what *should* be the position of the Hz source? If you want
to excite modes of all possible symmetries simultaneously, then the Hz
source should be somewhere in the z=0 plane but slightly offcenter in the
xy plane, so that it breaks the symmetry.
Second: What are the mirror symmetries plan in this structure?
If you want to excite all possible symmetries of resonant mode
simultaneously, and the only restriction is that you are looking for
TE-like modes (where there is a gap), then the only mirror symmetry that
you should apply is the z=0 even mirror plane.
Once you have identified a specific mode that you are interested in,
however, then you can add additional even/odd mirror planes (and
reposition the Hz source appropriately), to exploit the symmetries of that
particular mode.
Don't forget to keep in mind that the H field is a pseudovector, so its
even/odd symmetries are the opposite of what you might first expect from
looking at the fields.
Steven
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