Fig. 1. Schematic of electric dipole radiation. (a) Radiation diagram of a single electric dipole at point p; (b) radiation diagram of N electric dipoles at point p

Fig. 2. M-shaped structure distribution and structural parameters. (a) Position parameter of each M-typed structure as independent radiation; (b) top view of the designed M-shaped structure; (c) section and parameters of M-shaped structure

Fig. 3. Electric field intensity distribution of the SPB generated by different structure array. (a) V-shaped; (b) N-shaped; (c) M-shaped; (d) M+V-shaped; (e) transverse electric field intensity distribution of SPB at x=20 μm for these different structures; (f) polar diagram of electric field intensity at point A with varied polarization angle β

Fig. 4. Polar diagram of electric field intensity at point A with varied polarization angle β

Fig. 5. Electric field intensity distribution of the generated SPB with α and β in different conditions. (a) α=45°, β=0°; (b)(c) transverse electric field intensity distribution at x=20 μm with β=0° and varied angle α; (d) transverse electric field intensity at point A with β=0° and varied angle α

Fig. 6. Transverse electric field intensity distribution at x=20 μm for different L and w with α=45° and β=0°.(a) Different L;(b) different w