Seven-core fiber optical palm

We propose and construct the optical palm based on the seven-core optical fiber for particle trapping, multidimensional particle shooting, and controllable vibrations. This optical hand features a tunable three-dimensional optical trap, created using six independently controlled surrounding fiber cores and one central fiber core. By employing a signal generator to regulate the output optical power of each laser channel, we achieve photodynamic manipulation of the trapping particles. Through theoretical analysis and experiments, we discover that under two specific power configuration schemes, micro-particles can travel hundreds of micrometers along the direction of emitted light, reaching a maximum velocity of up to 404.43 μm/s. In the controllable vibration configuration, we achieve multidimensional controllable light-induced vibrations of the particles. Lastly, we find that in the symmetrical dual-core output light intensity phase difference modulation scheme (the dynamic manipulation of particles is achieved through active phase modulation of the light transmitted by a symmetrically arranged dual-core), the vibration amplitude of the micro-particles can be controlled by the phase difference of the modulation signal of the dual beam transmission light intensity, enabling the particles to be immobilized at Δφ=180°. Our proposed method extends the potential applications of optical manipulation based on optical fibers, such as in the multidirectional classification of micro-particles in biology and the induction of micro-cell vibrations to achieve uniform distribution of fluorescent markers within cells.