Theoretical Research Of Orbital Angular Momentum Of Beam And Experimental Research Of Optical Tweezers Sort Cell

Optical tweezers as a optical trap, which cause of highly compact laser beam, could capture biological large molecules particles, cell vehicles from several nm to tensμm, and does not affect surroundings of the catch, a non-contact, non-destructive bacterial operation. Optical rotation can operate particle on the angle, This adds the one-dimensional angle operation on the basis of three-dimensional operation. The orbital angular momentum of beam has now become one of the research hot spot.This issue include the theory of optical tweezers and optical rotation; optical tweezers micromanipulation biological cell in capillary and measure optical trapping force; Apply optical tweezers accurate sort microzyme; The theory of beam orbital angular momentum and the simulation of orbital angular momentum of Gauss votex beam.Firstly, the issue according to the theory of electromagnetic field, the orbital angular momentum density formula of a general beam was deduced; from the electric field intensity of a Gauss Vortex Beam, the orbital angular momentum density calculation formula of a Gaussian vortex beam was also deduced. The MATLAB program was applied to simulate the optical field distributions and the orbital angular momentum density distributions of Gauss Vortex Beams. Earlier theoretical analyses have been done for orbital angular momentum of Gaussian vortex beams applied to the optical micromanipula- tions.Secondly, the issue discussed the component, technical parameters of basically optical tweezers platform from optical tweezers platform that have set up. On this optical tweezers platform the experiment of optical micromani- pulate biological cell in capillary is researched, and calculated optical trapping force apply hydromechanics method on the basis of experiment data.In the end, based on optical micromanipulation optical accurate sort biological cell experiment is designed, and successivelly sortted target cell on the optical tweezers platform.