Broadband coupling scattering of all-dielectric conical multimer nanostructures

We numerically simulated the broadband scattering with electric and magnetic dipoles resonance on coupled dimeric and trimeric silicon nanocones. A single silicon nanocone shows the relatively narrow band electric and magnetic resonance scattering. The dimeric silicon nanocones indicate a mixed resonant mode, and the resonant scattering bandwidth is increased. These scattering optical responses are clarified by their scattering cross section and the spatial distributions of electromagnetic fields. Moreover, the scattering bandwidth of silicon nanotrimer is further increased.lnterestingly, a new magnetic resonant mode emerges at longer wavelength. Broadband resonant scattering results from optically magnetic coupling interaction between trimeric silicon nanocones.The effect of different particle diameter, shape and substrate on the scattering resonance of the electric dipole and magnetic dipole modes is numerically investigated for single, dimeric and trimeric silicon nanocones.