近轴圆对称光束的角动量及其应用

Angular Momentums of Paraxial and Cylindrical Symmetric Beams and Their Applications

本文简单介绍了光场角动量的基本定义与概念,各类圆对称光束的角动量。同时,光束角动量能通过π/2模式转换器产生,由此修正光束的位相结构。光的吸收可以同时导致光束的自旋角动量或轨道角动量转移给微米粒子,就像光学镊子一样引起粒子的转动,从而形成光学扳手。另外,简单介绍了圆对称光束作为光学镊子和光学扳手在微米粒子和生物细胞的光学导引、囚禁与操控等领域中的应用。

An introduction is given to the basic definition and conception of the angular momentums of the light field, and the angular momentums of a variety of cylindrical symmetric beams. At the same time, angular momentum may be produced by use of a π/2 mode converter, which modifies the phase structure of the beam. Absorption of the light allows both the spin and orbital angular momentum of a light beam to be transferred to microscopic particles held within optical tweezers, forming an optical spanner. In addition, as optical tweezers and spanners, the potential applications of cylindrical symmetric beams in optical guiding, traps, manipulations and controls of microscopic particles and biological cells are briefly discussed.