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Optical forces allow manipulation of small particles and control ofnanophotonic structures with light beams. Here, we describe a counter-intuitivelateral optical force acting on particles placed above a substrate, underuniform plane wave illumination without any field gradients. We show that undercircularly-polarized illumination, nanoparticles experience a lateral force asa result of dipolar, spin-sensitive scattering, with a magnitude comparable toother optical forces. To this end, we rigorously calculate the forceexperienced by a circularly polarized dipole radiating above a surface. Unlikefor linearly-polarized dipoles, force components parallel to the surface canexist, caused by the recoil of unidirectional guided modes excited at thesurface and/or by dipole-dipole interactions with the induced image dipole.These results were presented and discussed in conferences [1] and [2].

Lateral forces on nanoparticles near a surface under circularly-polarized plane-wave illumination