Theoretical research on trapping nanoparticles by a pulsed laser

In order to reduce the influence of the laser applied in optical tweezers on the cell activity, the attempt to substitute the traditional continuous laser by pulsed laser is put forward currently. But for the alternative source, the present study is generally focused on micron particles. This paper analyzes the forces on nanoparticles in pulsed optical tweezers theoretically, and the requirements for the pulsed laser under which the nanoparticles can be trapped stably. The results show that the ratio of the pulse interval vs the pulse duration should be chosen strictly for given particle besides the parameters existed in the traditional continuous optical tweezers.