Wide frequency tunable Terahertz vortex radiation with adjustable topological charge numbers

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-10-13 DOI:10.1016/j.nima.2025.171089

Yin Kang , Zhikai Zhou , Yaozong Xiao , Yixuan Liu , Weijie Fan , Kaiqing Zhang , Chao Feng

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引用次数: 0

Abstract

Terahertz (THz) vortex, which carries an orbital angular momentum, is increasingly significant for many scientific frontiers. However, the generation of THz vortex with both tunable frequency and tunable topological charge number is still a challenge for most existing methods. Recently, a narrowband THz vortex generation by vortex laser-beam interaction has been proposed to obtain THz vortex radiation (Zhang et al., IEEE Photonics Journal 14.1 (2022): 1–8). In this paper, a method to produce THz vortex with both tunable frequency at wide range and tunable topological charge number is introduced by combining the mentioned vortex laser-beam interaction and linear energy chirp compression technique, and detailed analyses are also presented. The 3D numerical simulation results show that the method can generate THz vortex with pulse energy of several

μ J

and tunable frequency by undulator radiation, while the transverse mode purity deteriorates with increase of topological charge number due to the diffraction effects. The coherent transition radiation (CTR) can produce THz vortex radiation with different topological charge numbers and relatively lower pulse energy, while preserving the transverse mode purity.

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宽频可调太赫兹涡旋辐射与可调的拓扑电荷数

太赫兹涡旋是一种具有轨道角动量的涡旋，在许多科学前沿领域具有越来越重要的意义。然而，产生频率可调、拓扑电荷数可调的太赫兹涡旋对大多数现有方法来说仍然是一个挑战。最近，人们提出了一种利用涡流激光束相互作用产生太赫兹涡旋的窄带方法来获得太赫兹涡旋辐射（Zhang et al., IEEE Photonics Journal 14.1(2022): 1-8）。本文介绍了一种将涡旋光束相互作用与线性能量啁啾压缩技术相结合，产生频率可调、拓扑电荷数可调的太赫兹涡旋的方法，并对其进行了详细的分析。三维数值模拟结果表明，该方法可以通过波动辐射产生脉冲能量为几μJ、频率可调的太赫兹涡流，但由于衍射效应，横向模式纯度随着拓扑电荷数的增加而下降。相干跃迁辐射（CTR）可以产生具有不同拓扑电荷数和相对较低脉冲能量的太赫兹涡旋辐射，同时保持横向模式的纯度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.