Dear Steven and MEEP's users,
My structure is PC slab (refractive index: n; slab thickness: 0.5a) with
triangular lattice of air holes (r: 0.35a ). The supercell (the total thickness
of the high-index and the air above and below the slab) is 4a. Point defect
cavity is formed in the center of the structure. The number of layers of air
holes that surround the defect is 5.
In my calculation, I study resonant frequencies vs. the nearest-neighbor
circular air-hole radius (r'). After making the structure, I apply the Hz
source in a "random" (non-symmetric) location in the z=0 plane. Similarly, I
apply harminv at the same non-symmetric point as where I put the source.
In the movie files:
When r' = r = 0.35a, I get only dipole mode; (Please, see in the attached
file)
When r' = 0.30a; 0.25a, I get only quadrupole; (Please, see in the attached
file)
When r' = 0.20a; 0.15a, I don't understand what that modes are; (Please,
see in the attached file).
In the result.out: I get resonant frequencies (in the PBG) , quality factor
Q, and some thing like that.
According to the paper (J. Appl. Phys., Vol. 92, pp.654). When r' = 0.25a,
They get monopole, dipole, quadrupole, and hexapole. In my calculation, I get
same result when r' = r = 0.35a; I don't understand my results are not correct
when reducing the radius of nearest neighbor holes. I think that my results are
not correct because my symmetries are not coorect. Could you give me some
suggestions about my mistakes?
I thank you in advance.
Sincerely,
Sung Park LEE
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