利用磁化等离子体中径向极化激光脉冲生成方位极化太赫兹辐射
Azimuthally polarized terahertz radiation generation using radially polarized laser pulse in magnetized plasma
AI总结：
研究通过洛伦兹力、连续性方程和麦克斯韦方程分析径向极化激光脉冲在磁化等离子体中的传播，发现生成等幅的横向电磁场构成太赫兹辐射场，并通过PIC模拟验证了辐射场的传播和参数对幅度的影响。
摘要：
本文通过洛伦兹力、连续性方程和麦克斯韦方程，给出了径向极化激光脉冲在均匀磁化等离子体中传播的解析公式。利用扰动技术与准静态近似（QSA）研究了非线性区域生成的场。生成的慢速、振荡、横向电和磁场具有等幅，构成频率在太赫兹（THz）范围的辐射场。使用粒子-网格（PIC）模拟代码FBPIC验证了解析结果。模拟研究表明，生成的太赫兹辐射场传播至等离子体边界外，表明相干电磁辐射发射。此外，场幅随等离子体密度非线性增加，随外部磁场强度线性增加，突显了这些参数在控制辐射幅度中的作用。
英文摘要：
An analytical formulation of a radially polarized laser pulse propagating in a homogeneous, magnetized plasma is presented using Lorentz force, continuity and Maxwells equations. Perturbation technique and quasi-static approximation (QSA) have been used to study the generated fields in nonlinear regime. The generated slow, oscillating, transverse electric and magnetic fields having equal amplitude, constitute a radiation field having frequency in the terahertz (THz) range. Particle-in-cell (PIC) simulation code FBPIC is used to validate analytical findings. Simulation studies also show that the generated THz radiation field propagates beyond the plasma boundary, indicating coherent electromagnetic radiation emission. Furthermore, the field amplitude scales nonlinearly with plasma density and increases linearly with external magnetic field strength, highlighting the role of these parameters in controlling radiation amplitude.
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