离轴多涡旋-高斯光束在负折射率介质中的传输特性  

Propagation properties of off-axis multi-vortex-Gaussian beams in negative refractive index media

作　　者：陈荣泉[1] 陈源福[1] 王清 吴志钢 CHEN Rongquan;CHEN Yuanfu;WANG Qing;WU Zhigang(College of Civil Engineering,Minnan University of Science and Technology,Quanzhou 362799,China;College of Science,Jiujiang University,Jiujiang 332005,China;Department of Automobile Maintenance,Shishi Pengshan Industry and Trade School,Quanzhou 362799,China)

机构地区：[1]闽南理工学院土木工程学院,福建泉州362799 [2]九江学院理学院,江西九江332005 [3]石狮鹏山工贸学校汽车维修系,福建泉州362799

出　　处：《量子电子学报》2022年第5期795-805,共11页Chinese Journal of Quantum Electronics

基　　金：福建省教育厅科技项目,JAT190893。

摘　　要：不同涡旋个数和拓扑荷的多涡旋-高斯光束具有不同光强和相位分布。当涡旋个数增大时,涡旋奇点个数增加,统计束宽也增大。利用分步傅里叶法数值模拟了多涡旋-高斯光束在负折射率非局域介质中的传输,发现涡旋点关于原点不对称或各涡旋点的拓扑荷不相等都可以改变孤子的传输方向,因此通过改变涡旋点位置和拓扑荷数可以实现光束传输方向的控制。若涡旋点虚部的符号发生改变,孤子的旋转方向也发生改变。此外,孤子的临界功率和轨道角动量都会随着拓扑荷的增加而增大。因此,可以通过涡旋点位置﹑涡旋点个数和拓扑荷的方式对光束信息进行编码,使光束在介质中传输时携带更多容量的信息。Multi-vortex-Gaussian beams with different numbers of vortices and topological charges have different light intensity and different phase distribution. When the number of vortices increases, the number of vortex singularities increases and the statistical beam width also increases. The propagation of multi-vortex-Gaussian beams in a non-local medium with negative refractive index is numerically simulated by the split-step Fourier method. It is found that the asymmetry of the vortex point about the origin or the unequal topological charges of each vortex point can result in the change of the transmission direction of the soliton, so the transmission direction of the beam can be controlled by changing the position of the vortex point and the number of topological charges. If the sign in front of the imaginary part of the vortex point changes, the rotation direction of the soliton will change. In addition, the critical power and orbital angular momentum of the soliton will increase with the increase of the topological charge. Therefore, the beam information can be encoded by the vortex point position, the number of vortex points, and the topological charge, so that the beam can carry more information when it is transmitted in the medium.

关 键 词：非线性光学 分步傅里叶法 强非局域介质 多涡旋-高斯光束 轨道角动量 

分 类 号：O437[机械工程—光学工程]