Spin Hall Effect Of Light In Spherical Structures

Spin-orbit interaction of light is ubiquitous in any optical system,but it is usually weak in dielectric particles.This paper shows that strong SOI can arise in dielectric particles with dual symmetry or core-shell nanoparticles,resulting in enhanced spin Hall effect of scattered light.The main research contents are listed as follows:1.Enhanced spin Hall effect of Light in spheres with dual symmetryThe spin-orbit interaction(SOI)of light is usually weak in dielectric particles and recently is enhanced in plasmonic structures.This article shows the relationship between spin Hall shift and dual symmetry.The interference between electric and magnetic dipolar modes plays an important role in enhancing the spin Hall shift.Strong SOI is demonstrated by the optical singularity of the orbital angular momentum.The results can find potential applications in dielectric-based photonic devices,such as optical sensing and manipulation of subwavelength nanoparticles.2.Enhanced broadband spin Hall effects by core-shell nanoparticlesWe demonstrate enhanced broadband spin Hall effects by using core-shell nanoparticles.The electric and magnetic dipoles can be tuned by the core-shell nanostructure with great freedom,and are excited simultaneously in a broadband spectrum,resulting in robust enhanced spin Hall shifts.Moreover,the coupling of the electric dipole and electric quadrupole gives rise to enhanced spin Hall shifts at both forward and backward directions.Numerical results from far-field and near-field verify the strong spin-orbit interaction of light.Our work offers a new way to exploit spin Hall effects in superresolution imaging and spin-dependent displacement sensing.