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We study the force of light on a two-level atom near an ultrathin opticalfiber using the mode function method and the Green tensor technique. We showthat the total force consists of the driving-field force, thespontaneous-emission recoil force, and the fiber-induced van der Waalspotential force. Due to the existence of a nonzero axial component of the fieldin a guided mode, the Rabi frequency and, hence, the magnitude of the force ofthe guided driving field may depend on the propagation direction. When theatomic dipole rotates in the meridional plane, the spontaneous-emission recoilforce may arise as a result of the asymmetric spontaneous emission with respectto opposite propagation directions. The van der Waals potential for the atom inthe ground state is off-resonant and opposite to the off-resonant part of thevan der Waals potential for the atom in the excited state. Unlike the potentialfor the ground state, the potential for the excited state may oscillatedepending on the distance from the atom to the fiber surface.

Force of light on a two-level atom near an ultrathin optical fiber