Fig. 1. (a) 1BZ diagram of the tetragonal lattice; (b) the section of the elliptical nanowire array primitive cell model.

Fig. 2. Comparison of the central elliptical nanowires (a) before and (b) after rotation.

Fig. 3. TE and TM modes band structure calculated along the high symmetry lines (a) for θ=0° and (b) for θ=90°.

Fig. 4. Stereograms of (a) band 1, (b) band 2, (c) band 3, and (d) band 4 that are calculated in the whole first BZ for the parallel elliptical nanowires array. The band values are projected to the plane of k to form a contour map at the bottom.

Fig. 5. Contour map of the four lowest TE mode energy bands of the PC when θ is 0°, 15°, 30°, 45°, 60°, 75°, and 90°. (a1)–(g1) band 1, (a2)–(g2) band 2, (a3)–(g3) band 3, (a4)–(g4) band 4.

Fig. 6. Contour map of the four lowest TM mode energy bands of the PC when θ is 0°, 15°, 30°, 45°, 60°, 75°, and 90°.

Fig. 7. First TE mode bandgap width of the arrays with the central element under different rotation angles.

Fig. 8. (a) Contour map of the four lowest TE mode energy bands of the perpendicular elliptical nanowires arrays at different rotations. The first, second, and third rows are array diagrams and energy bands rotated with respect to the θ=90° array in Fig. 5 by 15°, 30°, and 45°. (b) The first TE mode bandgap width of the perpendicular arrays under different rotation angles.