Abstract
We investigate the effect of radial anisotropy on the optical force exerted on the anisotropic-core/plasmonic-shell nanoparticles under the illumination of the zeroth order Bessel beam based on extended Mie theory and Maxwell's stress tensor method. Optical pulling force on such core-shell nanoparticles at Fano resonance is found, and such pulling force could be enhanced when the radial permittivity is much larger than the tangential permittivity of the anisotropic core. Furthermore, much strong pulling force is easy to be achieved for the negative permittivity of the anisotropic core. The optical pulling force could be also tunable by adjusting the anisotropic parameter, which can be used as the implement of particle selection. Our results will offer future prospects of nano-manipulation and provide the freedom of optical sorting and selection of nanoparticles.
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