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Schematic diagram of the four basic, , , , and , and four higher order waves, , , , and , in a square-lattice PC with circular holes.
(a) Theoretical bandstructure for TE-like modes, calculated using the 2D PWEM. (b) Experimental bandstructure. The dotted circles indicate the band edges. The higher band-edge frequencies ( and ) are degenerate, while two of the lower frequencies ( and ) are nondegenerate. These band-edge frequencies are expressed by the analytical formulas on the right side. The fine curves that appear between bands and are assumed to be TM-like mode dispersion curves.
The resonant frequencies as a function of a hole filling factor calculated by (a) the expression in Fig. 2(b) and the theoretical coupling constants, (b) the 2D PWEM.
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