径向偏振螺旋贝塞尔光束的传输特性及其自重建  

Propagation Characteristics and Self-reconstruction of Radially Polarized Spiral Bessel Beam

作　　者：胡汉青 吴逢铁 胡润 杨艳飞 HU Han-qing;WU Feng-tie;HU Run;YANG Yan-fei(Fujian Key Laboratory of Optical Beam Transmission and Transformation,College of Information Science and Engineering, Huaqiao University, Xiamen, Fujian 361021, China)

机构地区：[1]华侨大学信息科学与工程学院福建省光传输与变换重点实验室,福建厦门361021

出　　处：《光子学报》2019年第3期25-31,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(No.11774103);国家自然科学青年基金(No.61605049);福建省科技重大项目(No.2016H6016)~~

摘　　要：基于广义惠更斯-菲涅尔衍射理论,导出径向偏振螺旋贝塞尔光束的光场表达式,研究了该光束的传输特性和传输过程中光束偏振态的变化,及其通过扇形障碍物后的自重建特性.理论分析和数值计算发现:径向偏振螺旋贝塞尔光束在自由空间传输时,在一定传输区域内,光束以空心光束的形态绕光轴做离轴螺旋传输,光束的发散角为零并一直保持着径向偏振的特性;在光束的自重建过程中,始终保持离轴螺旋传输特性,随着传输距离的增加,原本在遮挡区域消失的能量,被逐渐衍射至障碍物遮挡区域的相反位置.Based on the generalized Huygens-Fresnel diffraction theory, the intensity expression of the radially polarized spiral Bessel beam is derived. The transmission characteristics, the change of the polarization state and self-reconstruction characteristics of the beam during transmission are studied. It is found that ,by the theoretical analysis and numerical calculation, when the radially polarized spiral Bessel beam is transmitted in free space, the beam is spirally transmitted around the optical axis in the form of a hollow beam and the divergence angle of the beam is zero in a certain transmission region. In addition, the characteristics of radial polarization are maintained during the transmission process. The off-axis spiral transmission characteristic is always maintained and the energy conservation law is followed in the self-reconstruction process of the beam. As the transmission distance increases, the energy originally disappeared in the occlusion region is gradually diffracted to the opposite position of the obstacle occlusion area.

关 键 词：物理光学 数值模拟与分析 衍射理论 径向偏振光束 螺旋贝塞尔光束 自重建 

分 类 号：O439[机械工程—光学工程]