Dynamic radiation force of a pulsed gaussian beam acting on rayleigh dielectric sphere.

We investigate the dynamic evolution of the radiation forces produced by the pulsed Gaussian beams acting on a Rayleigh dielectric sphere. We derive the analytical expressions for the scattering force and all components of the pondermotive force induced by the pulsed Gaussian beam. Our analysis shows that the radiation force can be greatly enhanced due to the effect of the short pulse duration, which leads to the enhancement of both the transverse and longitudinal radiation forces. And it is found that for the pulse with large pulse duration, it can be used for the stable trapping and manipulating the particle, while for the pulse with short pulse duration it may be used for guiding and moving the small dielectric particle. Finally we discuss the stability condition of the effectively trapping and manipulating the particle by the pulsed beam.