Abstract
A comprehensive dynamics simulation has been presented in a quad-beam optic fiber with intersection arrangement. As the offset distance changes, the motion type of dielectric micro-particle could transform from trapping to orbital rotation. Finally, they would be repelled far away from the trapping center due to weak centripetal forces. Different from dual-beam optic fiber configuration, this intersection arrangement has much stronger trapping force to attract the suspending particles. Moreover, the cross optical trapping having misalignment could generate a vortex field with symmetric characteristics, which cause the particles carrying out circular orbital movement. This novel optic fiber arrangement is conducive to the application of particle manipulation and provides more technical support in integrated microfluidic chip.