Annular and unidirectional transverse scattering with high directivity based on magnetoelectric coupling

Transverse scattering is a special directional scattering perpendicular to the propaga-tion direction, which has attracted great interest due to its potential applications from directional antennas, optical metrology to optical sensing. Here we reveal annular transverse scattering and unidirectional transverse scattering by magnetoelectric coupling of Omega particle. The annular transverse scattering can be achieved by the longitudinal dipole mode of the Omega particle. Furthermore, we demonstrate the highly asymmetric unidirectional transverse scattering by adjusting the transverse electric dipole (ED) and longitudinal magnetic dipole (MD) modes. Meanwhile, the forward scattering and backward scattering are suppressed by the interference of transverse ED and longitudinal MD modes. In particular, the lateral force exerted on the particle is accompanied by the transverse scattering. Our results provide a useful toolset for manipulating light scattered by the particle and broaden the application range of the particle with magnetoelectric coupling.

Automated summary

In this study, we investigate the annular transverse scattering and unidirectional transverse scattering by magnetoelectric coupling of the Ω particle. The annular transverse scattering is achieved by the longitudinal dipole mode of the Ω particle. Furthermore, we demonstrate highly asymmetric unidirectional transverse scattering by adjusting the transverse electric dipole and longitudinal magnetic dipole modes, while suppressing forward and backward scattering through interference. The lateral force exerted on the particle is accompanied by transverse scattering, providing a useful toolset for manipulating scattered light and expanding the application range of magnetoelectric particles.