Analyzing Of Orbital Angular Momentum Of Vortex Beams

Using a series of characteristics of the laser to achieve the manipulation of particles, especially nano-particles capture movement and so on, the so-called optical tweezers. However, the average refractive index of optical tweezers can catch a low refractive index than the surrounding particles, the refractive index of the capture efficiency of larger particles is relatively low, and the laser power increases will lead to damage in vivo particles. In the same laser power conditions, the focusing optical vortex generated by potential well sites greater than that generated by Gaussian beam potential well force, and focused optical vortex fields can also be passed through the orbital angular momentum of the particles to be captured rotation. Therefore, a gradual emphasis on modern optical micro-manipulation played a light vortex. Highly focused optical vortex fields can be tied not only to small particles can also be passed through the orbital angular momentum was bound particles rotate.This study covers the basic principles of optical vortex, orbital angular momentum of vortex beam characteristics and the use of optical vortices to achieve particle capture control of the three aspects of. In explaining aspects of optical vortex theory introduced vortex beam produced several methods and their advantages and disadvantages, and an analysis of how to capture the use of vortex beam particles, that is, from the theoretical calculations using the advantages of optical vortex trap particles. In introducing the vortex beam orbital angular momentum characteristics of a chapter, introduced the topological charge of traditional characteristics of an integer-like beam that, when generated vortex beam instrument is a spiral phase plate, how the output maximum orbital angular momentum; In addition, the article also describes the beam, a non-integer topological charge characteristics of the beam, that is generating such superposition of each beam density distribution and the optical model values of Gouy phase factor. Application of a chapter in the optical vortex, the present article theoretically calculate the light field in the vortex, the Michaelis-Menten particles and Rayleigh particle force, and hence come to how to enhance the stability of capture.In this paper, it includes five main parts: The first chapter describes the research background of optical vortex, studying history and current conditions. The second chapter describes the basic principle of optical vortex and the use of optical vortex trap particles capture time and capture force. Chapter III described the system's orbital angular momentum of the beam characteristics, is divided into an integer topological charge and non-integer orbital angular momentum of the beam characteristics. The final chapter describes the use of optical vortex achieve Michaelis capture particles and Rayleigh particle manipulation, that is, theoretical calculations of the strength of these two kinds of particles captured. The last part of the paper made a generalization.