Figure 3
Coupling coefficients κ 1, κ 2, and κ 3 vs. lattice cross angle θ from 90° to 60°. The refractive index contrast Δn = 0.008. Inset: Right, centered rectangular lattice PC in real space with lattice constant a and lattice cross angle θ. Left, reciprocal lattice space corresponding to the real space with lattice constant β.