Once started, the simulation progress can be tracked in the Q-Finder window. Upon completion, the total Q and partial Q values will be reported. The mode profile shown in Figure 3 can be opened by DataBROWSER. Using 8 grid points per period (Nper=8), we obtained total Q of about 4000, in-plane of about 5130, and out-of-plane of about 17900. Higher accuracy would require a smaller grid size (higher Nper).
The calculation of a 3D cavity mode is numerically intensive, and so it is worth noting that we used symmetry boundary conditions which, if there is full symmetry, results in an 8x problem size reduction. It is very important to select the symmetry conditions carefully, since some field components may be symmetric while others are anti-symmetric within the same mode. See Section 6.C.3 of the FullWAVE manual for more information, including a table to use the desired symmetry.
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1 K. Srinivasan and O. Painter, “Fourier space design of high-Q cavities in standard and compressed hexagonal lattice photonic crystals,” Optics Express 11, 579 (2003).