轴棱锥透镜系统产生局域空心光束的几何光学解释

利用几何光学的光线追迹法形象地描述了轴棱锥透镜系统产生局域空心光束过程.分析了局域空心光束传输过程中的光强分布;同时利用光线追迹法分析了透镜焦距对局域空心光束尺寸大小的影响.结果表明,局域空心光束的尺寸随着透镜焦距的增大而增大.实验中利用轴棱锥透镜系统产生局域空心光束,并对不同位置的光斑进行了拍摄,分析了局域空心光束的演变过程及其横向光强分布.实验与理论模拟的结果相吻合.因而容易选择不同尺寸的局域空心光束对不同微粒进行囚禁.

Geometric Optics Analysis on the Bottle Beam Generated From an Axicon-Lens System

The process of the bottle beam generated from an axicon-lens system is described by a novel method based on the ray-tracing.The intensity distribution of the bottle beam in propagation is analyzed.Using ray-tracing,the influence of the focaI length of the Iens on the sizes of bottle beam is analyzed.The result shows that the sizes of bottle beams increase with the increasing of the focal length of the lens.Experimentally the bottle beams are generated by using an axicon-lens system.The beam patterns are captured in different propagation position,and the evolution and transversalintensity distribution of bottle beam is analyzed.The experimentsl results fit well with the theoretical simulation.Therefore,we can choose right size bottle beam to manipulate different particles.