Radiation forces on gold nanoparticles in different laser tweezers

Gold nanoparticles have found very broad applications in nanomaterials, nanobiotechnology and health care. They are considered to be superior handles or probes relative to polystyrene beads for their own specific physical characteristics. But unfortunately they are considered difficult to trap stably by optical tweezers still owing to their specific physical characteristics. As known, obtaining high energy in very short period through a pulsed laser is easier than through a continuous laser, which is useful for trapping particles by optical tweezers. This paper theoretically analyzes the radiation forces on the gold nanoparticles in continuous optical tweezers and in pulsed optical tweezers, respectively, compares the forces in those two cases, and obtains the simulation curves for the forces.