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Optical forces due to spherical microresonators and their manifestation in optically induced orbital motion of nanoparticles

By considering the interaction between whispering-gallery modes of a spherical resonator and a subwavelength polarizable particle, we demonstrate that spatial confinement of the electromagnetic field dramatically changes the character of the optical forces exerted. We show that this phenomenon can be experimentally observed in the optically induced orbital motion of the particle.