激光光丝阵列太赫兹发射的频率调制
Frequency modulation of THz emission from a laser filament array
AI总结：
本研究采用行波天线模型理论研究横向与纵向激光光丝阵列的太赫兹发射，揭示周期性横向阵列通过干涉效应将单丝宽带频谱调制为离散频率谱，为太赫兹信号频率调控提供了新途径。
摘要：
本文采用一种简单的行波天线模型，对光丝阵列的发射特性开展了理论研究，同时考虑了横向和纵向两种光丝阵列构型。研究发现，太赫兹信号的角分布和功率会发生显著改变，这与已有文献报道的其他变化趋势一致。在特定条件下，太赫兹发射信号的频率成分也会受到强烈调制：单根光丝的发射为宽带频谱，而周期性横向光丝阵列的发射则包含若干离散频率。针对后者，太赫兹频谱可近似为两个因子的乘积——单根光丝的频谱，以及与光丝空间分布相关的复频率相关相位因子。该复相位因子体现了干涉效应，会放大幅值单根光丝频谱中的特定频率，同时抑制其他频率。最终频谱中离散频率的位置和宽度取决于光丝的数量及其间距。这些结果为调控太赫兹信号的频率成分提供了一种颇具潜力的可行途径。
英文摘要：
A simple traveling wave antenna model is used to theoretically study emission from an array of filaments. Both transverse and longitudinal arrays of filaments are considered. The angular distribution and power in the THz signal are significantly modified, which is consistent with other trends reported in the literature. The frequency content of the THz emission signal is also strongly modified under certain conditions. Whereas the emission from a single filament is broadband, the emission from a periodic transverse array consists of several discrete frequencies. For this latter case, the THz spectrum can be approximated as the product of two factors - the spectrum from a single filament and a complex frequency-dependent phase factor associated with the spatial distribution of the filaments. The complex phase factor accounts for interference effects, amplifying certain frequencies from the single filament spectrum while suppressing others. The location and width of the discrete frequencies present in the final spectrum depends on the number of filaments and their spacing. These results point to an interesting possibility of tailoring the frequency content in the THz signal.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
