  Optical trapping and manipulation using laser beams play a key role in many
areas including biology, atomic science, and nanofabrication. Here, we propose
and experimentally demonstrate the first use of a vortex-pair beam in optical
trapping and manipulation. We successfully trap two spherical microparticles
simultaneously by a single vortex-pair beam. Precisely position-controllable
manipulation of the trapped spherical microparticles is realized by adjusting
the off-axis distance of the vortices on the initial phase plane of the
vortex-pair beam. Based on the feature of the vortex-pair beam, as an optical
wrench, the high-precision angular-controllable rotation of the cylindrical
microrod is achieved by rotating the initial phase structure. Our result
provides a rich control on the trapping of microparticles and has greatly
important applications in biological area, and optically driven micromachines
or motors.
