Can a single gradientless light beam drag particles?

Details Can a single gradientless light beam drag particles? Can a single gradientless light beam drag particles?

2011-02-25

arxiv.org/abs/1102.5285v1

Phys. Rev. Lett. 107, 203601 (2011)

Physics

Optics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.203601

Usually a light beam pushes a particle when the photons act upon it. This is due to that the electric-dipole particle in the paraxial beam is considered. We investigate the scattering forces in non-paraxial gradientless beams and find that the forces can drag certain particles towards the beam source. The major criterion to be carried out to get the attractive force is the strong non-paraxiality of the light beam. The cone angle denoting the non-paraxiality has been investigated to unveil its importance on achieving dragging force. We hope the attractive forces will be very useful in nanoparticle manipulation.

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