Figure 1

The anisotropic slab and the small particle affected by the lateral force. The anisotropy axis, indicated by a thick blue arrow, forms an angle ϕ with the slab interface. Its thickness is h. Reference frames (x, y, z) and (x′, y′, z′) are associated with the slab interface and the anisotropy axis, respectively. The black arrow shows the direction of motion of the particle due to the action of the x-component of the radiative forces F x .