Fig. 1. Schematic diagram of the SPPs directional excitation based on catenary nanoparticle metasurface

Fig. 2. Spectral extinction ratio curve of unit catenary nanoparticle (Inset is the electric field distribution at typical wavelengths)

Fig. 3. Multipole scattering intensity distribution of unit catenary nanoparticles

Fig. 4. Array structure period parameter optimization results. (a) T_y; (b) T_x

Fig. 5. Spectral extinction ratio curves of catenary nanoparticle metasurfaces

Fig. 6. E_z field distribution of catenary nanoparticle metasurface. (a) Electric field amplitude; (b) Electric field phase