Capillary fiber-based optical machine gun for micro particle continuous shooting.

Based on the annular-core capillary fiber, we propose and demonstrate an optical machine gun that uses photodynamic to achieve directional continuous emission of particles. By grinding the oblique cone at one end of the fiber and soldering it with the single-mode fiber, the liquid containing particles is injected into the air hole while the ring core is illuminated. A 12° cone structure is processed at the other end of the annular-core capillary fiber. The light is reflected by the cone structure to form a cone-shell light field, which realizes the guidance of the particle. The effects of different fluid injection pressures on particle velocity and the relationship between particle velocity and optical power were studied. The experimental results show that under the condition of a certain injection pressure, the greater the output power of the fiber end, the greater the particle velocity; when the output power is constant, the change of liquid injection pressure has little effect on the particle velocity. Finally, when the liquid injection pressure is 40 mbar, the path changes before and after the annular core is illuminated are compared. When the output power of the fiber end is 0 mW, the particle path is divergent. When the output power of the fiber end is 150 mW, the particle path is in linear motion. Due to the unique fiber structure, the proposed fiber device achieves continuous directional continuous emission of particles. It has important value and application prospects in cell manipulation and analysis in microfluidic chip systems and directional drug particle delivery of cells.