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首页> 外文期刊>Physics of plasmas >OAM crosstalk of multiple coaxial THz vortex beams propagating through an inhomogeneous unmagnetized plasma slab
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OAM crosstalk of multiple coaxial THz vortex beams propagating through an inhomogeneous unmagnetized plasma slab

机译：OAM串扰的多个同轴THz涡流束通过不均匀的未达到的等离子体板传播

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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.
机译：使用载体角谱膨胀法进行传播通过不均匀的未识别等离子体板的多个同轴涡旋涡流的轨道角动量（OAM）交叉谈的调查。对于等离子体护套的双高斯分布模型，考虑到具有单拓扑电荷（Tc），双和四个Tcs的相干涡流的发生率，进行了反射和透射光束的幅度和OAM光谱的数值模拟，并讨论详细。结果表明，作为涡流束的倾斜发生率，不均匀的等离子体板对反射和传输光束的幅度谱和OAM光谱的扭曲的影响是至关重要的，并且由于接口之间的几个反射的影响，对反射光束的影响更为严重。横向平面中电场的轮廓的分布与入射光束的TCS密切相关。对于多个相干涡流的同轴发射，由干扰引起的附加相互交叉谈话随着TCS的差异而降低，并且在OAM复用期间需要考虑。径向积分距离的选择对主要OAM状态的权重具有明显的影响。这项工作为Terahertz OAM复用技术提供了一个重要的理论参考，用于解决等离子体护套引起的通信遮光。

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