We propose a novel way to trap and manipulate nano-objects above a dielectric substrate using an apertureless near-field probe. A combination of evanescent illumination and light scattering at the probe apex is used to shape the optical field into a localized, three-dimensional optical trap. We use the coupled-dipole method and the Maxwell stress tensor to provide a self-consistent description of the optical force, including retardation and the influence of the substrate. We show that small objects can be selectively captured and manipulated under realistic conditions.
Chaumet, P. C., Rahmani, A., & Nieto-Vesperinas, M. (2002). Optical trapping and manipulation of nano-objects with an apertureless probe. Physical Review Letters, 88(12), 1-4. . https://doi.org/10.1103/PhysRevLett.88.123601