OAM crosstalk of multiple coaxial THz vortex beams propagating through an inhomogeneous unmagnetized plasma slab

被引:9
|
作者
Li, Haiying [1 ]
Ding, Wei [1 ]
Liu, Jiawei [1 ]
Bai, Lu [1 ]
Wu, Zhensen [1 ]
机构
[1] Xidian Univ, Sch Phys & Optoelect Engn, Xian 710071, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
ORBITAL-ANGULAR-MOMENTUM; WAVE COMMUNICATION; TERAHERTZ; GENERATION; MODES;
D O I
10.1063/1.5119180
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
An investigation into the orbital angular momentum (OAM) cross talk of multiple coaxial terahertz vortex beams propagating through an inhomogeneous unmagnetized plasma slab was conducted using the vector angular spectrum expansion method. For the double Gaussian distribution model of plasma sheath, considering the incidence of coherent vortex beams with single topological charge (TC), double, and four TCs, numerical simulations of the amplitude and OAM spectra of the reflected and transmitted beams were carried out and discussed in detail. The results showed that, as an oblique incidence of vortex beams, the effects of an inhomogeneous plasma slab on the distortions of the magnitude profiles and OAM spectra of the reflected and transmitted beams were critical, and due to the effects of several reflections between interfaces, the effects on the reflected beam were more serious. The distribution of the contours of the electric fields in transverse planes was closely related to the TCs of the incident beams. For coaxial incidence of multiple coherent vortex beams, the additional mutual cross talk, which was caused by interference, decreased with the increasing difference in the TCs and needed to be considered during OAM multiplexing. The selection of the radial integral distance had an obvious impact on the weights of the primary OAM states. This work provides an important theoretical reference for terahertz OAM multiplexing technology in solving the communication blackout caused by the plasma sheath.
引用
收藏
页数:9
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