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Calculation of the radiation forces on a microsphere in the evanescent field of an optical nanofiber by ray tracing.

We use ray optics to calculate the radiation forces on a dielectric microsphere in the evanescent field of an optical nanofiber. We theoretically demonstrate that the gradient force may attract the microsphere onto the fiber surface. The scattering force may transport the microsphere along the fiber and in the light propagating direction. The impact of the sphere-fiber distance, sphere radius, and fiber radius on the scattering and gradient forces are investigated. The radius of nanofiber can be optimized for particle transportation.